$EXC
EXELON CORP Stock $exc

$exc Overview Financials Valuation SEC Filings Company Website

2015 Q4 Form 10-K Financial Statement

#000119312516457652 Filed on February 10, 2016

Income Statement

Concept	2015 Q4	2014 Q4	2014 Q3
Revenue	$6.702B	$7.255B	$6.912B
YoY Change	-7.62%	17.72%	6.31%
Cost Of Revenue	$2.874B	$3.604B	$2.648B
YoY Change	-20.26%	39.64%	-3.46%
Gross Profit	$3.827B	$3.652B	$4.264B
YoY Change	4.79%	1.95%	13.43%
Gross Profit Margin	57.1%	50.34%	61.69%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$467.0M	$825.0M	$836.0M
YoY Change	-43.39%	4483.33%	-4.13%
% of Gross Profit	12.2%	22.59%	19.61%
Operating Expenses	$3.127B	$3.412B	$2.865B
YoY Change	-8.35%	26.56%	12.71%
Operating Profit	$707.0M	$240.0M	$1.738B
YoY Change	194.58%	-72.91%	38.6%
Interest Expense	-$278.0M	-$343.0M	$247.0M
YoY Change	-18.95%	41.15%	8.33%
% of Operating Profit	-39.32%	-142.92%	14.21%
Other Income/Expense, Net	$133.0M	-$247.0M	-$242.0M
YoY Change	-153.85%	-252.47%	206.33%
Pretax Income	$563.0M	$115.0M	$1.496B
YoY Change	389.57%	-85.71%	27.32%
Income Tax	$268.0M	$20.00M	$422.0M
% Of Pretax Income	47.6%	17.39%	28.21%
Net Earnings	$309.0M	$18.00M	$993.0M
YoY Change	1616.67%	-96.36%	34.55%
Net Earnings / Revenue	4.61%	0.25%	14.37%
Basic Earnings Per Share	$0.34	$0.02	$1.15
Diluted Earnings Per Share	$0.33	$0.02	$1.15
COMMON SHARES
Basic Shares Outstanding	921.0M shares	861.0M shares	861.0M shares
Diluted Shares Outstanding	924.0M shares	868.0M shares	863.0M shares

Balance Sheet

Concept	2015 Q4	2014 Q4	2014 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$6.502B	$1.878B	$2.763B
YoY Change	246.22%	16.72%	68.07%
Cash & Equivalents	$6.502B	$1.878B	$2.763B
Short-Term Investments
Other Short-Term Assets	$752.0M	$865.0M	$1.022B
YoY Change	-13.06%	32.67%	46.21%
Inventory	$1.566B	$1.603B	$1.591B
Prepaid Expenses
Receivables	$3.187B	$3.482B	$2.815B
Other Receivables	$912.0M	$1.227B	$898.0M
Total Short-Term Assets	$15.33B	$11.85B	$11.84B
YoY Change	29.37%	16.93%	18.95%
LONG-TERM ASSETS
Property, Plant & Equipment	$57.44B	$52.17B	$51.63B
YoY Change	10.1%	10.23%	11.04%
Goodwill	$2.672B	$2.672B	$2.672B
YoY Change	0.0%	1.79%	1.79%
Intangibles
YoY Change
Long-Term Investments	$639.0M	$0.00	$0.00
YoY Change		-100.0%	-100.0%
Other Assets	$1.445B	$923.0M	$1.139B
YoY Change	56.55%	-4.25%	1.61%
Total Long-Term Assets	$80.05B	$74.56B	$73.43B
YoY Change	7.36%	6.84%	4.94%
TOTAL ASSETS
Total Short-Term Assets	$15.33B	$11.85B	$11.84B
Total Long-Term Assets	$80.05B	$74.56B	$73.43B
Total Assets	$95.38B	$86.42B	$85.26B
YoY Change	10.38%	8.12%	6.68%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.883B	$3.048B	$2.502B
YoY Change	-5.41%	22.71%	5.61%
Accrued Expenses	$2.376B	$1.539B	$1.462B
YoY Change	54.39%	-5.76%	-5.06%
Deferred Revenue
YoY Change
Short-Term Debt	$533.0M	$460.0M	$562.0M
YoY Change	15.87%	34.9%	162.62%
Long-Term Debt Due	$1.500B	$1.802B	$2.064B
YoY Change	-16.76%	19.42%	25.62%
Total Short-Term Liabilities	$9.118B	$8.762B	$8.431B
YoY Change	4.06%	13.38%	12.31%
LONG-TERM LIABILITIES
Long-Term Debt	$23.65B	$19.21B	$19.20B
YoY Change	23.07%	9.02%	9.2%
Other Long-Term Liabilities	$1.491B	$2.147B	$2.104B
YoY Change	-30.55%	-15.47%	-16.31%
Total Long-Term Liabilities	$25.14B	$21.36B	$21.30B
YoY Change	17.68%	5.93%	6.01%
TOTAL LIABILITIES
Total Short-Term Liabilities	$9.118B	$8.762B	$8.431B
Total Long-Term Liabilities	$25.14B	$21.36B	$21.30B
Total Liabilities	$68.06B	$62.28B	$60.21B
YoY Change	9.28%	9.3%	4.55%
SHAREHOLDERS EQUITY
Retained Earnings	$12.07B	$10.91B	$11.16B
YoY Change	10.61%	5.33%	10.16%
Common Stock	$18.68B	$16.71B	$16.68B
YoY Change	11.77%	-0.19%	-0.22%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.327B	$2.327B	$2.327B
YoY Change	0.0%	0.0%	0.0%
Treasury Stock Shares	35.00M shares	35.00M shares	35.00M shares
Shareholders Equity	$25.79B	$22.61B	$23.60B
YoY Change
Total Liabilities & Shareholders Equity	$95.38B	$86.42B	$85.26B
YoY Change	10.38%	8.12%	7.03%

Cashflow Statement

Concept	2015 Q4	2014 Q4	2014 Q3
OPERATING ACTIVITIES
Net Income	$309.0M	$18.00M	$993.0M
YoY Change	1616.67%	-96.36%	34.55%
Depreciation, Depletion And Amortization	$467.0M	$825.0M	$836.0M
YoY Change	-43.39%	4483.33%	-4.13%
Cash From Operating Activities	$1.942B	$814.0M	$1.892B
YoY Change	138.57%	-58.23%	-7.98%
INVESTING ACTIVITIES
Capital Expenditures	-$2.181B	-$1.963B	-$1.613B
YoY Change	11.11%	30.17%	17.82%
Acquisitions
YoY Change
Other Investing Activities	$48.00M	$740.0M	$424.0M
YoY Change	-93.51%	780.95%	-915.38%
Cash From Investing Activities	-$2.133B	-$1.223B	-$1.189B
YoY Change	74.41%	-14.12%	-16.33%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-572.0M	-476.0M	698.0M
YoY Change	20.17%	-15.0%	3777.78%
NET CHANGE
Cash From Operating Activities	1.942B	814.0M	1.892B
Cash From Investing Activities	-2.133B	-1.223B	-1.189B
Cash From Financing Activities	-572.0M	-476.0M	698.0M
Net Change In Cash	-763.0M	-885.0M	1.401B
YoY Change	-13.79%	2428.57%	114.55%
FREE CASH FLOW
Cash From Operating Activities	$1.942B	$814.0M	$1.892B
Capital Expenditures	-$2.181B	-$1.963B	-$1.613B
Free Cash Flow	$4.123B	$2.777B	$3.505B
YoY Change	48.47%	-19.67%	2.34%

Facts In Submission

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CY2015	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2015	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2015	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
CY2015	dei	Document Period End Date DocumentPeriodEndDate	2015-12-31
CY2015	dei	Document Type DocumentType	10-K
CY2015	dei	Entity Central Index Key EntityCentralIndexKey	0001109357
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CY2015	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2015	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2015	dei	Entity Registrant Name EntityRegistrantName	EXELON CORP
CY2015	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2015	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
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CY2014	exc	Increase Decrease In Counterparty Collateral Net IncreaseDecreaseInCounterpartyCollateralNet	1719000000	USD
CY2015	exc	Increase Decrease In Counterparty Collateral Net IncreaseDecreaseInCounterpartyCollateralNet	-347000000	USD
CY2014	exc	Inventory Adjustments During Period InventoryAdjustmentsDuringPeriod	29000000	USD
CY2015	exc	Inventory Adjustments During Period InventoryAdjustmentsDuringPeriod	23000000	USD
CY2014Q4	exc	Investments In Nonconsolidated Variable Interest Entities InvestmentsInNonconsolidatedVariableInterestEntities	9000000	USD
CY2015Q4	exc	Investments In Nonconsolidated Variable Interest Entities InvestmentsInNonconsolidatedVariableInterestEntities	11000000	USD
CY2015Q4	exc	Letters Of Credit Held LettersOfCreditHeld	69000000	USD
CY2014Q4	exc	Long Term Debt To Financing Trusts Fair Value Disclosure LongTermDebtToFinancingTrustsFairValueDisclosure	641000000	USD
CY2015Q4	exc	Long Term Debt To Financing Trusts Fair Value Disclosure LongTermDebtToFinancingTrustsFairValueDisclosure	641000000	USD
CY2014Q1	exc	Low Share Price LowSharePrice	26.45	USD
CY2014Q2	exc	Low Share Price LowSharePrice	33.11	USD
CY2014Q3	exc	Low Share Price LowSharePrice	30.66	USD
CY2014Q4	exc	Low Share Price LowSharePrice	33.07	USD
CY2015Q1	exc	Low Share Price LowSharePrice	31.71	USD
CY2015Q2	exc	Low Share Price LowSharePrice	31.28	USD
CY2015Q3	exc	Low Share Price LowSharePrice	28.41	USD
CY2015Q4	exc	Low Share Price LowSharePrice	25.09	USD
CY2014	exc	Members Equity Including Portion Attributable To Noncontrolling Interest Acquisitions MembersEquityIncludingPortionAttributableToNoncontrollingInterestAcquisitions	273000000	USD
CY2015	exc	Members Equity Including Portion Attributable To Noncontrolling Interest Acquisitions MembersEquityIncludingPortionAttributableToNoncontrollingInterestAcquisitions	202000000	USD
CY2015	exc	Minimum Expectation Of Tax Position To Be Realized MinimumExpectationOfTaxPositionToBeRealized	0.5
CY2014	exc	Minority Interest Increase From Acquisition MinorityInterestIncreaseFromAcquisition	-4000000	USD
CY2015	exc	Minority Interest Increase From Acquisition MinorityInterestIncreaseFromAcquisition	4000000	USD
CY2014	exc	Near Zero Emissions Coal Fueled Generation Plant NearZeroEmissionsCoalFueledGenerationPlant	166	MW
CY2015Q4	exc	Net Asset Liability Position After Contractual Right Of Offset NetAssetLiabilityPositionAfterContractualRightOfOffset	38000000	USD
CY2014Q4	exc	Net Assets Pending Transactions Excluded NetAssetsPendingTransactionsExcluded	42000000	USD
CY2015Q4	exc	Net Assets Pending Transactions Excluded NetAssetsPendingTransactionsExcluded	27000000	USD
CY2013	exc	Net Income Loss Attributable To Noncontrolling Interest And Preferred Stock Dividends And Other Adjustments NetIncomeLossAttributableToNoncontrollingInterestAndPreferredStockDividendsAndOtherAdjustments	10000000	USD
CY2014	exc	Net Income Loss Attributable To Noncontrolling Interest And Preferred Stock Dividends And Other Adjustments NetIncomeLossAttributableToNoncontrollingInterestAndPreferredStockDividendsAndOtherAdjustments	197000000	USD
CY2015	exc	Net Income Loss Attributable To Noncontrolling Interest And Preferred Stock Dividends And Other Adjustments NetIncomeLossAttributableToNoncontrollingInterestAndPreferredStockDividendsAndOtherAdjustments	-19000000	USD
CY2013	exc	Net Interest Income Expense Related To Uncertain Tax Positions NetInterestIncomeExpenseRelatedToUncertainTaxPositions	391000000	USD
CY2014	exc	Net Interest Income Expense Related To Uncertain Tax Positions NetInterestIncomeExpenseRelatedToUncertainTaxPositions	-36000000	USD
CY2015	exc	Net Interest Income Expense Related To Uncertain Tax Positions NetInterestIncomeExpenseRelatedToUncertainTaxPositions	-13000000	USD
CY2014Q4	exc	Net Interest Receivable Payable Related To Uncertain Tax Positions NetInterestReceivablePayableRelatedToUncertainTaxPositions	-310000000	USD
CY2015Q4	exc	Net Interest Receivable Payable Related To Uncertain Tax Positions NetInterestReceivablePayableRelatedToUncertainTaxPositions	-288000000	USD
CY2013	exc	Net Unrealized Gain Loss On Pledged Assets NetUnrealizedGainLossOnPledgedAssets	7000000	USD
CY2014	exc	Net Unrealized Gain Loss On Pledged Assets NetUnrealizedGainLossOnPledgedAssets	29000000	USD
CY2015	exc	Net Unrealized Gain Loss On Pledged Assets NetUnrealizedGainLossOnPledgedAssets	7000000	USD
CY2015	exc	Netpresentvalueofsettlementamount Netpresentvalueofsettlementamount	430000000	USD
CY2015	exc	Non Cash Licensing Agreement NonCashLicensingAgreement	95000000	USD
CY2014	exc	Noncash Purchase Accounting Adjustment NoncashPurchaseAccountingAdjustment	3400000000	USD
	exc	Note Receivable NoteReceivable	27000000	USD
CY2015Q4	exc	Notional Amount Interest Rate Swap Merger Acquiree NotionalAmountInterestRateSwapMergerAcquiree	2400000000	USD
CY2015	exc	Nuclear Decommissioning Annual Recovery Current NuclearDecommissioningAnnualRecoveryCurrent	24000000	USD
CY2013	exc	Nuclear Fuel Amortization NuclearFuelAmortization	921000000	USD
CY2014	exc	Nuclear Fuel Amortization NuclearFuelAmortization	1073000000	USD
CY2015	exc	Nuclear Fuel Amortization NuclearFuelAmortization	1116000000	USD
CY2014Q4	exc	Nuclear Fuel Fabrication And Installation Stage NuclearFuelFabricationAndInstallationStage	1003000000	USD
CY2015Q4	exc	Nuclear Fuel Fabrication And Installation Stage NuclearFuelFabricationAndInstallationStage	1266000000	USD
CY2015Q4	exc	Nuclear Insurance Annual Coverage Limit NuclearInsuranceAnnualCoverageLimit	18300000.0	USD
CY2015	exc	Nuclear Insurance Financial Protection Pool Surcharge On Nuclear Incident Assessment NuclearInsuranceFinancialProtectionPoolSurchargeOnNuclearIncidentAssessment	0.05
CY2014Q4	exc	Number Of Variable Interest Entities Consolidated NumberOfVariableInterestEntitiesConsolidated	6	VIE
CY2015Q4	exc	Number Of Variable Interest Entities Consolidated NumberOfVariableInterestEntitiesConsolidated	7	VIE
CY2014Q4	exc	Number Of Variable Interest Entities Not Consolidated NumberOfVariableInterestEntitiesNotConsolidated	6	VIE
CY2015Q4	exc	Number Of Variable Interest Entities Not Consolidated NumberOfVariableInterestEntitiesNotConsolidated	8	VIE
CY2015Q4	exc	Open Asbestos Related Personal Injury Claims OpenAsbestosRelatedPersonalInjuryClaims	228	Open_claim
CY2015Q4	exc	Operating Income Loss Quarter OperatingIncomeLossQuarter	707000000	USD
CY2015Q4	exc	Operating Leases Future Minimum Payments Due Beyond Five Years OperatingLeasesFutureMinimumPaymentsDueBeyondFiveYears	702000000	USD
CY2013	exc	Other Comprehensive Income Loss Net Of Tax Period Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodDecrease	0	USD
CY2014	exc	Other Comprehensive Income Loss Net Of Tax Period Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodDecrease	116000000	USD
CY2015	exc	Other Comprehensive Income Loss Net Of Tax Period Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodDecrease	0	USD
CY2014	exc	Other Comprehensive Income Loss Neto Of Tax Period Decrease OtherComprehensiveIncomeLossNetoOfTaxPeriodDecrease	-116000000	USD
CY2013	exc	Other Comprehensive Income Lossexcluding Equity Method Aoci Netof Tax OtherComprehensiveIncomeLossexcludingEquityMethodAOCINetofTax	727000000	USD
CY2014	exc	Other Comprehensive Income Lossexcluding Equity Method Aoci Netof Tax OtherComprehensiveIncomeLossexcludingEquityMethodAOCINetofTax	-528000000	USD
CY2015	exc	Other Comprehensive Income Lossexcluding Equity Method Aoci Netof Tax OtherComprehensiveIncomeLossexcludingEquityMethodAOCINetofTax	60000000	USD
CY2013	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Net Of Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentNetOfTax	-669000000	USD
CY2014	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Net Of Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentNetOfTax	497000000	USD
CY2015	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Net Of Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentNetOfTax	99000000	USD
CY2013	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentTax	-430000000	USD
CY2014	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentTax	317000000	USD
CY2015	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentTax	62000000	USD
CY2013	exc	Other Comprehensive Income Unrealized Gain Loss On Equity Investments Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnEquityInvestmentsArisingDuringPeriodTax	-71000000	USD
CY2014	exc	Other Comprehensive Income Unrealized Gain Loss On Equity Investments Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnEquityInvestmentsArisingDuringPeriodTax	73000000	USD
CY2015	exc	Other Comprehensive Income Unrealized Gain Loss On Equity Investments Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnEquityInvestmentsArisingDuringPeriodTax	1000000	USD
CY2013	exc	Other Comprehensive Income Unrealized Income Loss On Equity Investments Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedIncomeLossOnEquityInvestmentsArisingDuringPeriodNetOfTax	106000000	USD
CY2014	exc	Other Comprehensive Income Unrealized Income Loss On Equity Investments Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedIncomeLossOnEquityInvestmentsArisingDuringPeriodNetOfTax	8000000	USD
CY2015	exc	Other Comprehensive Income Unrealized Income Loss On Equity Investments Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedIncomeLossOnEquityInvestmentsArisingDuringPeriodNetOfTax	-3000000	USD
CY2013	exc	Other Decommissioning Related Activity OtherDecommissioningRelatedActivity	-169000000	USD
CY2014	exc	Other Decommissioning Related Activity OtherDecommissioningRelatedActivity	-132000000	USD
CY2015	exc	Other Decommissioning Related Activity OtherDecommissioningRelatedActivity	-82000000	USD
CY2013	exc	Other Derivatives Not Designated As Hedging Instruments Change In Fair Value OtherDerivativesNotDesignatedAsHedgingInstrumentsChangeInFairValue	-5000000	USD
CY2014	exc	Other Derivatives Not Designated As Hedging Instruments Change In Fair Value OtherDerivativesNotDesignatedAsHedgingInstrumentsChangeInFairValue	-92000000	USD
CY2015	exc	Other Derivatives Not Designated As Hedging Instruments Change In Fair Value OtherDerivativesNotDesignatedAsHedgingInstrumentsChangeInFairValue	49000000	USD
CY2013	exc	Other Derivatives Not Designated As Hedging Instruments Gain Loss Net OtherDerivativesNotDesignatedAsHedgingInstrumentsGainLossNet	507000000	USD
CY2014	exc	Other Derivatives Not Designated As Hedging Instruments Gain Loss Net OtherDerivativesNotDesignatedAsHedgingInstrumentsGainLossNet	-693000000	USD
CY2015	exc	Other Derivatives Not Designated As Hedging Instruments Gain Loss Net OtherDerivativesNotDesignatedAsHedgingInstrumentsGainLossNet	357000000	USD
CY2013	exc	Other Derivatives Not Designated As Hedging Instruments Reclassification To Realized At Settlement OtherDerivativesNotDesignatedAsHedgingInstrumentsReclassificationToRealizedAtSettlement	-1000000	USD
CY2014	exc	Other Derivatives Not Designated As Hedging Instruments Reclassification To Realized At Settlement OtherDerivativesNotDesignatedAsHedgingInstrumentsReclassificationToRealizedAtSettlement	-2000000	USD
CY2015	exc	Other Derivatives Not Designated As Hedging Instruments Reclassification To Realized At Settlement OtherDerivativesNotDesignatedAsHedgingInstrumentsReclassificationToRealizedAtSettlement	58000000	USD
CY2015Q4	exc	Other Miscellaneous Unamortized Energy Contracts OtherMiscellaneousUnamortizedEnergyContracts	44000000	USD
CY2013	exc	Other Noncash Income Expense Net OtherNoncashIncomeExpenseNet	-53000000	USD
CY2014	exc	Other Noncash Income Expense Net OtherNoncashIncomeExpenseNet	-2000000	USD
CY2015	exc	Other Noncash Income Expense Net OtherNoncashIncomeExpenseNet	11000000	USD
CY2014Q4	exc	Other Nonconsolidated Variable Interest Entity Ownership Interests OtherNonconsolidatedVariableInterestEntityOwnershipInterests	144000000	USD
CY2015Q4	exc	Other Nonconsolidated Variable Interest Entity Ownership Interests OtherNonconsolidatedVariableInterestEntityOwnershipInterests	269000000	USD
CY2015Q4	exc	Parent Company Pension Opeb Regulatory Assets Noncurrent ParentCompanyPensionOpebRegulatoryAssetsNoncurrent	3156000000	USD
CY2013	exc	Pension And Other Postretirement Benefit Expense Included In Capital And Operating And Maintenance Expense PensionAndOtherPostretirementBenefitExpenseIncludedInCapitalAndOperatingAndMaintenanceExpense	825000000	USD
CY2014	exc	Pension And Other Postretirement Benefit Expense Included In Capital And Operating And Maintenance Expense PensionAndOtherPostretirementBenefitExpenseIncludedInCapitalAndOperatingAndMaintenanceExpense	561000000	USD
CY2015	exc	Pension And Other Postretirement Benefit Expense Included In Capital And Operating And Maintenance Expense PensionAndOtherPostretirementBenefitExpenseIncludedInCapitalAndOperatingAndMaintenanceExpense	637000000	USD
CY2013	exc	Performance Share Awards Obligations To Be Settled In Cash PerformanceShareAwardsObligationsToBeSettledInCash	12000000	USD
CY2014	exc	Performance Share Awards Obligations To Be Settled In Cash PerformanceShareAwardsObligationsToBeSettledInCash	13000000	USD
CY2015	exc	Performance Share Awards Obligations To Be Settled In Cash PerformanceShareAwardsObligationsToBeSettledInCash	29000000	USD
CY2013Q4	exc	Performance Share Awards Weighted Average Grand Date Fair Value PerformanceShareAwardsWeightedAverageGrandDateFairValue	31.55	USD
CY2014Q4	exc	Performance Share Awards Weighted Average Grand Date Fair Value PerformanceShareAwardsWeightedAverageGrandDateFairValue	28.75	USD
CY2015Q4	exc	Performance Share Awards Weighted Average Grand Date Fair Value PerformanceShareAwardsWeightedAverageGrandDateFairValue	35.88	USD
CY2014Q4	exc	Por Allowance PorAllowance	42000000	USD
CY2015Q4	exc	Por Allowance PorAllowance	31000000	USD
CY2014Q4	exc	Por Gross Receivables PorGrossReceivables	290000000	USD
CY2015Q4	exc	Por Gross Receivables PorGrossReceivables	229000000	USD
CY2014Q4	exc	Por Net Receivables PorNetReceivables	248000000	USD
CY2015Q4	exc	Por Net Receivables PorNetReceivables	198000000	USD
CY2014	exc	Pre Tax Loss PreTaxLoss	1000000	USD
CY2013	exc	Preference Stock Acquired PreferenceStockAcquired	-6000000	USD
CY2014Q1	exc	Proceeds From Lease Termination ProceedsFromLeaseTermination	335000000	USD
CY2013	exc	Proceeds From Lease Termination ProceedsFromLeaseTermination	0	USD
CY2014	exc	Proceeds From Lease Termination ProceedsFromLeaseTermination	335000000	USD
CY2015	exc	Proceeds From Lease Termination ProceedsFromLeaseTermination	0	USD
CY2013	exc	Proprietary Trading Activities Change In Fair Value ProprietaryTradingActivitiesChangeInFairValue	1000000	USD
CY2014	exc	Proprietary Trading Activities Change In Fair Value ProprietaryTradingActivitiesChangeInFairValue	1000000	USD
CY2015	exc	Proprietary Trading Activities Change In Fair Value ProprietaryTradingActivitiesChangeInFairValue	8000000	USD
CY2013	exc	Proprietary Trading Activities Gain Loss Net ProprietaryTradingActivitiesGainLossNet	-39000000	USD
CY2014	exc	Proprietary Trading Activities Gain Loss Net ProprietaryTradingActivitiesGainLossNet	-26000000	USD
CY2015	exc	Proprietary Trading Activities Gain Loss Net ProprietaryTradingActivitiesGainLossNet	-8000000	USD
CY2013	exc	Proprietary Trading Activities Reclassification To Realized At Settlement ProprietaryTradingActivitiesReclassificationToRealizedAtSettlement	-3000000	USD
CY2014	exc	Proprietary Trading Activities Reclassification To Realized At Settlement ProprietaryTradingActivitiesReclassificationToRealizedAtSettlement	3000000	USD
CY2015	exc	Proprietary Trading Activities Reclassification To Realized At Settlement ProprietaryTradingActivitiesReclassificationToRealizedAtSettlement	-10000000	USD
CY2013	exc	Public Utilities Approved Equity Capital Structure Annual Reconciliation Percentage PublicUtilitiesApprovedEquityCapitalStructureAnnualReconciliationPercentage	0.0694
CY2014	exc	Public Utilities Approved Equity Capital Structure Annual Reconciliation Percentage PublicUtilitiesApprovedEquityCapitalStructureAnnualReconciliationPercentage	0.0704
CY2015	exc	Public Utilities Approved Equity Capital Structure Annual Reconciliation Percentage PublicUtilitiesApprovedEquityCapitalStructureAnnualReconciliationPercentage	0.0702
CY2013	exc	Public Utilities Approved Equity Capital Structure Initial Revenue Requirement Percentage PublicUtilitiesApprovedEquityCapitalStructureInitialRevenueRequirementPercentage	0.0694
CY2014	exc	Public Utilities Approved Equity Capital Structure Initial Revenue Requirement Percentage PublicUtilitiesApprovedEquityCapitalStructureInitialRevenueRequirementPercentage	0.0706
CY2015	exc	Public Utilities Approved Equity Capital Structure Initial Revenue Requirement Percentage PublicUtilitiesApprovedEquityCapitalStructureInitialRevenueRequirementPercentage	0.0705
CY2013	exc	Public Utilities Approved Rate Increase Decrease Annual Reconciliation Amount PublicUtilitiesApprovedRateIncreaseDecreaseAnnualReconciliationAmount	181000000	USD
CY2014	exc	Public Utilities Approved Rate Increase Decrease Annual Reconciliation Amount PublicUtilitiesApprovedRateIncreaseDecreaseAnnualReconciliationAmount	72000000	USD
CY2015	exc	Public Utilities Approved Rate Increase Decrease Annual Reconciliation Amount PublicUtilitiesApprovedRateIncreaseDecreaseAnnualReconciliationAmount	-152000000	USD
CY2013	exc	Public Utilities Approved Rate Increase Decrease Initial Revenue Requirement Amount PublicUtilitiesApprovedRateIncreaseDecreaseInitialRevenueRequirementAmount	160000000	USD
CY2014	exc	Public Utilities Approved Rate Increase Decrease Initial Revenue Requirement Amount PublicUtilitiesApprovedRateIncreaseDecreaseInitialRevenueRequirementAmount	160000000	USD
CY2015	exc	Public Utilities Approved Rate Increase Decrease Initial Revenue Requirement Amount PublicUtilitiesApprovedRateIncreaseDecreaseInitialRevenueRequirementAmount	85000000	USD
CY2013	exc	Public Utilities Approved Returnon Equity Annual Reconciliation Percentage PublicUtilitiesApprovedReturnonEquityAnnualReconciliationPercentage	0.0872
CY2014	exc	Public Utilities Approved Returnon Equity Annual Reconciliation Percentage PublicUtilitiesApprovedReturnonEquityAnnualReconciliationPercentage	0.0920
CY2015	exc	Public Utilities Approved Returnon Equity Annual Reconciliation Percentage PublicUtilitiesApprovedReturnonEquityAnnualReconciliationPercentage	0.0909
CY2013	exc	Public Utilities Approved Returnon Equity Initial Revenue Requirement Percentage PublicUtilitiesApprovedReturnonEquityInitialRevenueRequirementPercentage	0.0872
CY2014	exc	Public Utilities Approved Returnon Equity Initial Revenue Requirement Percentage PublicUtilitiesApprovedReturnonEquityInitialRevenueRequirementPercentage	0.0925
CY2015	exc	Public Utilities Approved Returnon Equity Initial Revenue Requirement Percentage PublicUtilitiesApprovedReturnonEquityInitialRevenueRequirementPercentage	0.0914
CY2015Q4	exc	Qualified Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year QualifiedDefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear	250000000	USD
CY2013	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	77000000	USD
CY2014	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	159000000	USD
CY2015	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	156000000	USD
CY2013	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	256000000	USD
CY2014	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	216000000	USD
CY2015	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	232000000	USD
CY2014Q1	exc	Reclassificationsto Operating Income Loss ReclassificationstoOperatingIncomeLoss	-1000000	USD
CY2014Q2	exc	Reclassificationsto Operating Income Loss ReclassificationstoOperatingIncomeLoss	7000000	USD
CY2014Q3	exc	Reclassificationsto Operating Income Loss ReclassificationstoOperatingIncomeLoss	2000000	USD
CY2013	exc	Regulatory Offset Nuclear Decommissioning Trust Fund Activity RegulatoryOffsetNuclearDecommissioningTrustFundActivity	546000000	USD
CY2014	exc	Regulatory Offset Nuclear Decommissioning Trust Fund Activity RegulatoryOffsetNuclearDecommissioningTrustFundActivity	358000000	USD
CY2015	exc	Regulatory Offset Nuclear Decommissioning Trust Fund Activity RegulatoryOffsetNuclearDecommissioningTrustFundActivity	-21000000	USD
CY2015	exc	Related Party Purchase Of Nuclear Output By Third Party Percentage RelatedPartyPurchaseOfNuclearOutputByThirdPartyPercentage	0.4999
CY2015	exc	Related Party Purchase Of Nuclear Output Percentage RelatedPartyPurchaseOfNuclearOutputPercentage	0.5001
CY2015	exc	Related Party Transaction Required Purchase Of Power Percentage RelatedPartyTransactionRequiredPurchaseOfPowerPercentage	0.85
CY2013	exc	Related Party Transaction Utilities Operating Expense Fuel Used Total RelatedPartyTransactionUtilitiesOperatingExpenseFuelUsedTotal	1256000000	USD
CY2014	exc	Related Party Transaction Utilities Operating Expense Fuel Used Total RelatedPartyTransactionUtilitiesOperatingExpenseFuelUsedTotal	531000000	USD
CY2015	exc	Related Party Transaction Utilities Operating Expense Fuel Used Total RelatedPartyTransactionUtilitiesOperatingExpenseFuelUsedTotal	0	USD
CY2014Q4	exc	Restricted Stock Units Obligations Not Yet Settled RestrictedStockUnitsObligationsNotYetSettled	85000000	USD
CY2015Q4	exc	Restricted Stock Units Obligations Not Yet Settled RestrictedStockUnitsObligationsNotYetSettled	97000000	USD
CY2015Q4	exc	Restricted Stock Units Obligations To Be Settled In Cash RestrictedStockUnitsObligationsToBeSettledInCash	56000000	USD
CY2014Q1	exc	Revenue Reduction RevenueReduction	8000000	USD
CY2014	exc	Smart Grid Grant Project Capital Expenditures SmartGridGrantProjectCapitalExpenditures	74000000	USD
CY2014	exc	Smart Grid Grant Reimbursements SmartGridGrantReimbursements	95000000	USD
CY2013	exc	Stock Issued During Period Shares Long Term Incentive Plan Activity StockIssuedDuringPeriodSharesLongTermIncentivePlanActivity	1445000	shares
CY2014	exc	Stock Issued During Period Shares Long Term Incentive Plan Activity StockIssuedDuringPeriodSharesLongTermIncentivePlanActivity	1574000	shares
CY2015	exc	Stock Issued During Period Shares Long Term Incentive Plan Activity StockIssuedDuringPeriodSharesLongTermIncentivePlanActivity	1430000	shares
CY2013	exc	Stock Issued During Period Value Long Term Incentive Plan Activity StockIssuedDuringPeriodValueLongTermIncentivePlanActivity	81000000	USD
CY2014	exc	Stock Issued During Period Value Long Term Incentive Plan Activity StockIssuedDuringPeriodValueLongTermIncentivePlanActivity	72000000	USD
CY2015	exc	Stock Issued During Period Value Long Term Incentive Plan Activity StockIssuedDuringPeriodValueLongTermIncentivePlanActivity	70000000	USD
CY2015	exc	Substation Kilovolt SubstationKilovolt	500000	V
CY2013	exc	Tax Benefit From Performance Share Awards Distributed TaxBenefitFromPerformanceShareAwardsDistributed	11000000	USD
CY2014	exc	Tax Benefit From Performance Share Awards Distributed TaxBenefitFromPerformanceShareAwardsDistributed	11000000	USD
CY2015	exc	Tax Benefit From Performance Share Awards Distributed TaxBenefitFromPerformanceShareAwardsDistributed	18000000	USD
CY2013	exc	Tax Benefit From Restricted Stock Units Distributed TaxBenefitFromRestrictedStockUnitsDistributed	11000000	USD
CY2014	exc	Tax Benefit From Restricted Stock Units Distributed TaxBenefitFromRestrictedStockUnitsDistributed	17000000	USD
CY2015	exc	Tax Benefit From Restricted Stock Units Distributed TaxBenefitFromRestrictedStockUnitsDistributed	30000000	USD
CY2013	exc	Tax Benefit From Stock Deferral Plan TaxBenefitFromStockDeferralPlan	1000000	USD
CY2014	exc	Tax Benefit From Stock Deferral Plan TaxBenefitFromStockDeferralPlan	0	USD
CY2015	exc	Tax Benefit From Stock Deferral Plan TaxBenefitFromStockDeferralPlan	0	USD
CY2014Q4	exc	Total Balance Sheet Classification Of Obligations Related To Outstanding Performance Share Awards Not Yet Settled TotalBalanceSheetClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettled	97000000	USD
CY2015Q4	exc	Total Balance Sheet Classification Of Obligations Related To Outstanding Performance Share Awards Not Yet Settled TotalBalanceSheetClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettled	95000000	USD
CY2014Q4	exc	Total Deferred Credits And Other Liabilities TotalDeferredCreditsAndOtherLiabilities	33668000000	USD
CY2015Q4	exc	Total Deferred Credits And Other Liabilities TotalDeferredCreditsAndOtherLiabilities	34658000000	USD
CY2014Q4	exc	Total Deferred Debits And Other Assets TotalDeferredDebitsAndOtherAssets	22393000000	USD
CY2015Q4	exc	Total Deferred Debits And Other Assets TotalDeferredDebitsAndOtherAssets	22611000000	USD
CY2014Q4	exc	Total Long Term Investments TotalLongTermInvestments	544000000	USD
CY2015Q4	exc	Total Long Term Investments TotalLongTermInvestments	639000000	USD
CY2013	exc	Unrealized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	146000000	USD
CY2014	exc	Unrealized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	134000000	USD
CY2015	exc	Unrealized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	-197000000	USD
CY2013	exc	Unrealized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	406000000	USD
CY2014	exc	Unrealized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	180000000	USD
CY2015	exc	Unrealized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	-282000000	USD
CY2013	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsNonregulatoryAccounting	146000000	USD
CY2014	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsNonregulatoryAccounting	134000000	USD
CY2015	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsNonregulatoryAccounting	-197000000	USD
CY2013	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsRegulatoryAccounting	406000000	USD
CY2014	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsRegulatoryAccounting	180000000	USD
CY2015	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsRegulatoryAccounting	-282000000	USD
CY2014Q4	exc	Unrecognized Tax Benefits For Which Timing Of Ultimate Benefits Uncertain UnrecognizedTaxBenefitsForWhichTimingOfUltimateBenefitsUncertain	1129000000	USD
CY2015Q4	exc	Unrecognized Tax Benefits For Which Timing Of Ultimate Benefits Uncertain UnrecognizedTaxBenefitsForWhichTimingOfUltimateBenefitsUncertain	540000000	USD
CY2013	exc	Unrecognized Tax Benefits Increases Decreases Only Affecting Timing UnrecognizedTaxBenefitsIncreasesDecreasesOnlyAffectingTiming	649000000	USD
CY2014	exc	Unrecognized Tax Benefits Increases Decreases Only Affecting Timing UnrecognizedTaxBenefitsIncreasesDecreasesOnlyAffectingTiming	-255000000	USD
CY2015	exc	Unrecognized Tax Benefits Increases Decreases Only Affecting Timing UnrecognizedTaxBenefitsIncreasesDecreasesOnlyAffectingTiming	-705000000	USD
CY2013	exc	Unrecognized Tax Benefits Interest Income UnrecognizedTaxBenefitsInterestIncome	24000000	USD
CY2014	exc	Unrecognized Tax Benefits Interest Income UnrecognizedTaxBenefitsInterestIncome	40000000	USD
CY2015	exc	Unrecognized Tax Benefits Interest Income UnrecognizedTaxBenefitsInterestIncome	1000000	USD
CY2013	exc	Utility Taxes UtilityTaxes	449000000	USD
CY2014	exc	Utility Taxes UtilityTaxes	456000000	USD
CY2015	exc	Utility Taxes UtilityTaxes	474000000	USD
CY2014Q4	exc	Variable Interest Entity Consolidated Carrying Amount Current Assets VariableInterestEntityConsolidatedCarryingAmountCurrentAssets	1275000000	USD
CY2015Q4	exc	Variable Interest Entity Consolidated Carrying Amount Current Assets VariableInterestEntityConsolidatedCarryingAmountCurrentAssets	909000000	USD
CY2014Q4	exc	Variable Interest Entity Consolidated Carrying Amount Current Liabilities VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities	611000000	USD
CY2015Q4	exc	Variable Interest Entity Consolidated Carrying Amount Current Liabilities VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities	473000000	USD
CY2014Q4	exc	Variable Interest Entity Consolidated Carrying Amount Non Current Assets VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets	7573000000	USD
CY2015Q4	exc	Variable Interest Entity Consolidated Carrying Amount Non Current Assets VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets	8009000000	USD
CY2014Q4	exc	Variable Interest Entity Consolidated Carrying Amount Non Current Liabilities VariableInterestEntityConsolidatedCarryingAmountNonCurrentLiabilities	2728000000	USD
CY2015Q4	exc	Variable Interest Entity Consolidated Carrying Amount Non Current Liabilities VariableInterestEntityConsolidatedCarryingAmountNonCurrentLiabilities	2927000000	USD
CY2015	exc	Weighted Average Period Non Vested Performance Share Awards Are Expected To Be Recognized Over WeightedAveragePeriodNonVestedPerformanceShareAwardsAreExpectedToBeRecognizedOver	P1Y4M24D
CY2014Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	1491000000	USD
CY2015Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	1774000000	USD
CY2014Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	3048000000	USD
CY2015Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	2883000000	USD
CY2014Q4	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	5000000	USD
CY2015Q4	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	5000000	USD
CY2014Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	8000000	USD
CY2015Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	8000000	USD
CY2014Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	3482000000	USD
CY2015Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	3187000000	USD
CY2014Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1539000000	USD
CY2015Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	2376000000	USD
CY2014Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	555000000	USD
CY2015Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	622000000	USD
CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	14742000000	USD
CY2015Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	16375000000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2040000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2684000000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2624000000	USD
CY2013	us-gaap	Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	718000000	USD
CY2014	us-gaap	Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	1054000000	USD
CY2015	us-gaap	Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	1109000000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	118000000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	127000000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	119000000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	74000000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	80000000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	73000000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	311000000	USD
CY2015Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	284000000	USD
CY2013	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	212000000	USD
CY2014	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	191000000	USD
CY2015	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	170000000	USD
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	20000000	shares
CY2014	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	17000000	shares
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	16000000	shares
CY2013	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	275000000	USD
CY2014	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	345000000	USD
CY2015	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	398000000	USD
CY2014Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	7295000000	USD
CY2015Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	8585000000	USD
CY2014Q4	us-gaap	Assets Assets	86416000000	USD
CY2015Q4	us-gaap	Assets Assets	95384000000	USD
CY2014Q4	us-gaap	Assets Current AssetsCurrent	11853000000	USD
CY2015Q4	us-gaap	Assets Current AssetsCurrent	15334000000	USD
CY2014Q4	us-gaap	Assets Held In Trust Noncurrent AssetsHeldInTrustNoncurrent	319000000	USD
CY2015Q4	us-gaap	Assets Held In Trust Noncurrent AssetsHeldInTrustNoncurrent	206000000	USD
CY2014Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	147000000	USD
CY2015Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	4000000	USD
CY2015Q2	us-gaap	Bridge Loan BridgeLoan	3200000000.0	USD
CY2014Q2	us-gaap	Bridge Loan BridgeLoan	7200000000.0	USD
CY2015Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Transaction Costs BusinessAcquisitionCostOfAcquiredEntityTransactionCosts	259000000	USD
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	121000000	USD
CY2014	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	179000000	USD
CY2015	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	80000000	USD
CY2013	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	0	USD
CY2014	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	289000000	USD
CY2015	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	0	USD
CY2013	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	-38000000	USD
CY2014	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	220000000	USD
CY2015	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	96000000	USD
CY2013	us-gaap	Capital Leases Income Statement Direct Financing Lease Revenue CapitalLeasesIncomeStatementDirectFinancingLeaseRevenue	28000000	USD
CY2014	us-gaap	Capital Leases Income Statement Direct Financing Lease Revenue CapitalLeasesIncomeStatementDirectFinancingLeaseRevenue	24000000	USD
CY2015	us-gaap	Capital Leases Income Statement Direct Financing Lease Revenue CapitalLeasesIncomeStatementDirectFinancingLeaseRevenue	15000000	USD
CY2014Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases CapitalLeasesNetInvestmentInDirectFinancingLeases	361000000	USD
CY2015Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases CapitalLeasesNetInvestmentInDirectFinancingLeases	352000000	USD
CY2014Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Deferred Income CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome	324000000	USD
CY2015Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Deferred Income CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome	287000000	USD
CY2014Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Unguaranteed Residual Values Of Leased Property CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty	685000000	USD
CY2015Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Unguaranteed Residual Values Of Leased Property CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty	639000000	USD
CY2000Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Unguaranteed Residual Values Of Leased Property CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty	1600000000	USD
CY2013	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	198000000	USD
CY2014	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	186000000	USD
CY2015	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	208000000	USD
CY2014Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	596000000	USD
CY2015Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	633000000	USD
CY2013	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2014	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	140000000	USD
CY2015	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1486000000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1609000000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1878000000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6502000000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	1119000000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	5766000000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	123000000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	269000000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	4624000000	USD
CY2014Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	35000000	USD
CY2015Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	36000000	USD
CY2013	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.46
CY2014	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.24
CY2015	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.24
CY2014Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2015Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2015Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	12.50
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	859833343	shares
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	859833343	shares
CY2015Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	919924742	shares
CY2015Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	919924742	shares
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	16709000000	USD
CY2015Q4	us-gaap	Common Stock Value CommonStockValue	18676000000	USD
CY2013	us-gaap	Competitive Energy Revenue CompetitiveEnergyRevenue	12496000000	USD
CY2014	us-gaap	Competitive Energy Revenue CompetitiveEnergyRevenue	13773000000	USD
CY2015	us-gaap	Competitive Energy Revenue CompetitiveEnergyRevenue	15200000000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2456000000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1176000000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2310000000	USD
CY2013	us-gaap	Cost Of Goods And Services Energy Commodities And Services CostOfGoodsAndServicesEnergyCommoditiesAndServices	6928000000	USD
CY2014	us-gaap	Cost Of Goods And Services Energy Commodities And Services CostOfGoodsAndServicesEnergyCommoditiesAndServices	9369000000	USD
CY2015	us-gaap	Cost Of Goods And Services Energy Commodities And Services CostOfGoodsAndServicesEnergyCommoditiesAndServices	10007000000	USD
CY2013	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	2540000000	USD
CY2014	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	3103000000	USD
CY2015	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	3077000000	USD
CY2015	us-gaap	Cost Of Reimbursable Expense CostOfReimbursableExpense	40000000	USD
CY2013	us-gaap	Costs And Expenses CostsAndExpenses	21242000000	USD
CY2014	us-gaap	Costs And Expenses CostsAndExpenses	25039000000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	25056000000	USD
CY2014Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	20864000000	USD
CY2015Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	25113000000	USD
CY2015Q4	us-gaap	Debt Instrument Collateral Amount DebtInstrumentCollateralAmount	2400000000	USD
CY2014Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	333000000	USD
CY2015Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	275000000	USD
CY2015Q4	us-gaap	Debt Instrument Fee Amount DebtInstrumentFeeAmount	5000000	USD
CY2015	us-gaap	Debt Instrument Interest Rate Stated Percentage Rate Range Maximum DebtInstrumentInterestRateStatedPercentageRateRangeMaximum	0.0395
CY2014Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-37000000	USD
CY2015Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-63000000	USD
CY2014	us-gaap	Debt Issuance Costs DebtIssuanceCosts	150000000	USD
CY2015	us-gaap	Debt Issuance Costs DebtIssuanceCosts	180000000	USD
CY2014Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	10537000000	USD
CY2015Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	10342000000	USD
CY2014Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	155000000	USD
CY2015Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	90000000	USD
CY1999Q4	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	1200000000	USD
CY2014Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	12217000000	USD
CY2015Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	13149000000	USD
CY2013	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	119000000	USD
CY2014	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	502000000	USD
CY2015	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	752000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	-563000000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	-595000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Subject To Expiration DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration	111000000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Subject To Expiration DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration	103000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	97000000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	327000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	-112000000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	-133000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	46000000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	203000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-1029000000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-1112000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	12143000000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	13393000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	1824000000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	1706000000	USD
CY2014Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	3366000000	USD
CY2015Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	3385000000	USD
CY2015	us-gaap	Defined Benefit Plan Amount To Be Amortized From Accumulated Other Comprehensive Income Loss Next Fiscal Year DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear	-64000000	USD
CY2015	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	89000000	USD
CY2015	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	9000000	USD
CY2015	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	100000000	USD
CY2015	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	12000000	USD
CY2014Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2015Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2013	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	85000000	USD
CY2014	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	103000000	USD
CY2015	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	148000000	USD
CY2013	us-gaap	Depreciation Depreciation	1893000000	USD
CY2014	us-gaap	Depreciation Depreciation	2080000000	USD
CY2015	us-gaap	Depreciation Depreciation	2227000000	USD
CY2013	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3779000000	USD
CY2014	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3868000000	USD
CY2015	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3987000000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2153000000	USD
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2314000000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2450000000	USD
CY2014Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	794000000	USD
CY2015Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	1236000000	USD
CY2014Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	1279000000	USD
CY2015Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	1365000000	USD
CY2014Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	773000000	USD
CY2015Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	758000000	USD
CY2014Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	43000000	USD
CY2015Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	52000000	USD
CY2014Q4	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	-3000000	USD
CY2015Q4	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	5000000	USD
CY2014Q4	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue	10000000	USD
CY2015Q4	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue	8000000	USD
CY2014Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	234000000	USD
CY2015Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	205000000	USD
CY2014Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	403000000	USD
CY2015Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	374000000	USD
	us-gaap	Derivative Loss On Derivative DerivativeLossOnDerivative	64000000	USD
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1254000000	USD
CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1111000000	USD
CY2014Q1	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.31
CY2014Q2	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.31
CY2014Q3	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.31
CY2014Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.31
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CY2015Q3	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.31
CY2015Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.31
CY2013	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	14000000	USD
CY2014	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	131000000	USD
CY2015	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	13000000	USD
CY2014Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	8000000	USD
CY2015Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	8000000	USD
CY2014Q4	us-gaap	Due To Related Parties Current And Noncurrent DueToRelatedPartiesCurrentAndNoncurrent	648000000	USD
CY2015Q4	us-gaap	Due To Related Parties Current And Noncurrent DueToRelatedPartiesCurrentAndNoncurrent	648000000	USD
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.02
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.88
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2014Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	641000000	USD
CY2015Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	641000000	USD
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.02
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.00
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.15
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.54
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.376
CY2014	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.268
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.322
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0.016
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0.024
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0.019
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.000
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.020
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.007
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.018
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.003
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.002
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.000
CY2013	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.048
CY2014	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.013
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.037
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.019
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.011
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.009
CY2013	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	9365000000	USD
CY2014	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	9467000000	USD
CY2015	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	9876000000	USD
CY2013	us-gaap	Electrical Generation Revenue ElectricalGenerationRevenue	14277000000	USD
CY2014	us-gaap	Electrical Generation Revenue ElectricalGenerationRevenue	16637000000	USD
CY2015	us-gaap	Electrical Generation Revenue ElectricalGenerationRevenue	18395000000	USD
CY2015Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	27000000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	44000000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	47000000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	46000000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	8000000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	3000000	USD
CY2014Q4	us-gaap	Energy Marketing Accounts Payable EnergyMarketingAccountsPayable	192000000	USD
CY2015Q4	us-gaap	Energy Marketing Accounts Payable EnergyMarketingAccountsPayable	302000000	USD
CY2014Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	238000000	USD
CY2015Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	100000000	USD
CY2014Q4	us-gaap	Energy Marketing Contract Liabilities Noncurrent EnergyMarketingContractLiabilitiesNoncurrent	211000000	USD
CY2015Q4	us-gaap	Energy Marketing Contract Liabilities Noncurrent EnergyMarketingContractLiabilitiesNoncurrent	117000000	USD
CY2014Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	254000000	USD
CY2015Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	86000000	USD
CY2014Q4	us-gaap	Energy Marketing Contracts Assets Noncurrent EnergyMarketingContractsAssetsNoncurrent	549000000	USD
CY2015Q4	us-gaap	Energy Marketing Contracts Assets Noncurrent EnergyMarketingContractsAssetsNoncurrent	484000000	USD
CY2014Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	579000000	USD
CY2015Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	462000000	USD
CY2014Q4	us-gaap	Equity Method Investment Aggregate Cost EquityMethodInvestmentAggregateCost	50000000	USD
CY2015Q4	us-gaap	Equity Method Investment Aggregate Cost EquityMethodInvestmentAggregateCost	112000000	USD
CY2013	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2014	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	296000000	USD
CY2015	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2015	us-gaap	Extinguishment Of Debt Amount ExtinguishmentOfDebtAmount	44000000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1830000000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	46000000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	82000000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	77000000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	79000000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	50000000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	2585000000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	755000000	USD
CY2015Q2	us-gaap	Forward Contract Indexed To Issuers Equity Indexed Shares ForwardContractIndexedToIssuersEquityIndexedShares	23000000	shares
CY2014	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	18000000	USD
CY2015	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	17000000	USD
CY2013	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	13000000	USD
CY2014	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	437000000	USD
CY2015	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	18000000	USD
CY2013	us-gaap	Gain Loss On Investments GainLossOnInvestments	170000000	USD
CY2014	us-gaap	Gain Loss On Investments GainLossOnInvestments	210000000	USD
CY2015	us-gaap	Gain Loss On Investments GainLossOnInvestments	-131000000	USD
CY2015	us-gaap	Gain Loss On Sale Of Derivatives GainLossOnSaleOfDerivatives	-26000000	USD
CY2013	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	13000000	USD
CY2014	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	437000000	USD
CY2015	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	18000000	USD
CY2013	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	1246000000	USD
CY2014	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	1325000000	USD
CY2015	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	1176000000	USD
CY2013Q4	us-gaap	Goodwill Goodwill	2625000000	USD
CY2014Q4	us-gaap	Goodwill Goodwill	2672000000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	2672000000	USD
CY2013Q4	us-gaap	Goodwill Gross GoodwillGross	4608000000	USD
CY2014Q4	us-gaap	Goodwill Gross GoodwillGross	4655000000	USD
CY2015Q4	us-gaap	Goodwill Gross GoodwillGross	4655000000	USD
CY2013Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	1983000000	USD
CY2014Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	1983000000	USD
CY2015Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	1983000000	USD
CY2015	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2015Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	75000000	USD
CY2015Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	9206000000	USD
CY2013	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	171000000	USD
CY2014	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	687000000	USD
CY2015	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	36000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	2773000000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	2486000000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	3330000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2773000000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2486000000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3330000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.01
CY2014	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.89
CY2015	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.55
CY2013	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	10000000	USD
CY2014	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-20000000	USD
CY2013	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	10000000	USD
CY2014	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-20000000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-7000000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1044000000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	666000000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1073000000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	112000000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	314000000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	342000000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-116000000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	49000000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-121000000	USD
CY2013	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	883000000	USD
CY2014	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-143000000	USD
CY2015	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	97000000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	100000000	USD
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	380000000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-4000000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-128000000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	157000000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	387000000	USD
CY2014	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	2000000	USD
CY2013	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	97000000	USD
CY2014	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	318000000	USD
CY2015	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-240000000	USD
CY2013	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	43000000	USD
CY2014	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	104000000	USD
CY2015	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-66000000	USD
CY2013	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4000000	shares
CY2014	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4000000	shares
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3000000	shares
CY2013	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	54000000	USD
CY2014	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	63000000	USD
CY2015	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	79000000	USD
CY2013	us-gaap	Interest Costs Incurred InterestCostsIncurred	1423000000	USD
CY2014	us-gaap	Interest Costs Incurred InterestCostsIncurred	1144000000	USD
CY2015	us-gaap	Interest Costs Incurred InterestCostsIncurred	1170000000	USD
CY2013	us-gaap	Interest Expense InterestExpense	1315000000	USD
CY2014	us-gaap	Interest Expense InterestExpense	1024000000	USD
CY2015	us-gaap	Interest Expense InterestExpense	992000000	USD
CY2013	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	41000000	USD
CY2014	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	41000000	USD
CY2015	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	41000000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	866000000	USD
CY2014	us-gaap	Interest Paid Net InterestPaidNet	940000000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	930000000	USD
CY2014Q4	us-gaap	Interest Payable Current InterestPayableCurrent	240000000	USD
CY2015Q4	us-gaap	Interest Payable Current InterestPayableCurrent	915000000	USD
CY2013	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	1356000000	USD
CY2014	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	1065000000	USD
CY2015	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	1033000000	USD
CY2014Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	1024000000	USD
CY2015Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	1104000000	USD
CY2013	us-gaap	Inventory Write Down InventoryWriteDown	9000000	USD
CY2014	us-gaap	Inventory Write Down InventoryWriteDown	5000000	USD
CY2015	us-gaap	Inventory Write Down InventoryWriteDown	10000000	USD
CY2013	us-gaap	Investment Income Interest InvestmentIncomeInterest	8000000	USD
CY2014	us-gaap	Investment Income Interest InvestmentIncomeInterest	1000000	USD
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	8000000	USD
CY2015Q2	us-gaap	Junior Subordinated Long Term Notes JuniorSubordinatedLongTermNotes	1150000000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	806000000	USD
CY2014	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	865000000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	922000000	USD
CY2015Q4	us-gaap	Liabilities Current LiabilitiesCurrent	9118000000	USD
CY2015Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2015Q4	us-gaap	Line Of Credit Facility Capacity Available For Trade Purchases LineOfCreditFacilityCapacityAvailableForTradePurchases	6341000000	USD
CY2015	us-gaap	Line Of Credit Facility Covenant Terms LineOfCreditFacilityCovenantTerms	2.50 to 1
CY2015Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	6947000000	USD
CY2015Q4	us-gaap	Long Term Debt LongTermDebt	25761000000	USD
CY2014Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	1802000000	USD
CY2015Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	1500000000	USD
CY2014Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1802000000	USD
CY2015Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1500000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	16756000000	USD
CY2015Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1478000000	USD
CY2014Q4	us-gaap	Liabilities Liabilities	62283000000	USD
CY2015Q4	us-gaap	Liabilities Liabilities	68062000000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	86416000000	USD
CY2015Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	95384000000	USD
CY2014Q4	us-gaap	Liabilities Current LiabilitiesCurrent	8762000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1487000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	3311000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	973000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1393000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1841000000	USD
CY2014Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	19212000000	USD
CY2015Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	23645000000	USD
CY2014Q4	us-gaap	Long Term Investments LongTermInvestments	544000000	USD
CY2015Q4	us-gaap	Long Term Investments LongTermInvestments	639000000	USD
CY2014Q4	us-gaap	Minority Interest MinorityInterest	1332000000	USD
CY2015Q4	us-gaap	Minority Interest MinorityInterest	1308000000	USD
CY2014	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	421000000	USD
CY2014	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	1071000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-826000000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	411000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	4830000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-5394000000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4599000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7822000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	6343000000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4457000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	7616000000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1719000000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1623000000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2269000000	USD
CY2014	us-gaap	Noncash Merger Related Costs NoncashMergerRelatedCosts	44000000	USD
CY2013	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	-18000000	USD
CY2014	us-gaap	Noncontrolling Interest Increase From Sale Of Parent Equity Interest NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest	1548000000	USD
CY2013	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-896000000	USD
CY2014	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-610000000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1079000000	USD
CY2014Q4	us-gaap	Nontrade Receivables Current NontradeReceivablesCurrent	82000000	USD
CY2015Q4	us-gaap	Nontrade Receivables Current NontradeReceivablesCurrent	76000000	USD
CY2014Q4	us-gaap	Nontrade Receivables Noncurrent NontradeReceivablesNoncurrent	7000000	USD
CY2015Q4	us-gaap	Nontrade Receivables Noncurrent NontradeReceivablesNoncurrent	14000000	USD
CY2015Q4	us-gaap	Notes Receivable Net NotesReceivableNet	15000000	USD
CY2015	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	9	Reportable_segment
CY2013	us-gaap	Operating Expenses OperatingExpenses	21242000000	USD
CY2014	us-gaap	Operating Expenses OperatingExpenses	25039000000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	25056000000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	3669000000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	3096000000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	4409000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1174000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	133000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	70000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	74000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	86000000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	109000000	USD
CY2014Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	113000000	USD
CY2015Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	133000000	USD
CY2014	us-gaap	Other Alternative Energy Sales Revenue OtherAlternativeEnergySalesRevenue	154000000	USD
CY2014Q4	us-gaap	Other Assets Current OtherAssetsCurrent	865000000	USD
CY2015Q4	us-gaap	Other Assets Current OtherAssetsCurrent	748000000	USD
CY2014Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	923000000	USD
CY2015Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1445000000	USD
CY2015Q4	us-gaap	Other Commitment OtherCommitment	3500000	USD
CY2013	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-10000000	USD
CY2014	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-9000000	USD
CY2015	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-21000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	0	USD
CY2014	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-30000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-46000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	0	USD
CY2014	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	19000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	30000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-528000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-136000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	727000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-644000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	60000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	78000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	4000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-208000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-147000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-220000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	133000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	93000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	140000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-468000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	412000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-53000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-248000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-148000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	9000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	166000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	96000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-6000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2013	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	7270000000	USD
CY2014	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	8568000000	USD
CY2015	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	8322000000	USD
CY2013	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	2153000000	USD
CY2014	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	2314000000	USD
CY2015	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	2450000000	USD
CY2013	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	159000000	USD
CY2014	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	200000000	USD
CY2015	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	201000000	USD
CY2014Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	931000000	USD
CY2015Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	842000000	USD
CY2014Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2147000000	USD
CY2015Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1491000000	USD
CY2013	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-718000000	USD
CY2014	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1054000000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1109000000	USD
CY2013	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	32000000	USD
CY2014	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	9000000	USD
CY2015	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	17000000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	460000000	USD
CY2014	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	455000000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-46000000	USD
CY2013	us-gaap	Other Operating Income OtherOperatingIncome	46000000	USD
CY2015	us-gaap	Other Operating Income OtherOperatingIncome	757000000	USD
CY2014Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	1742000000	USD
CY2015Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	1618000000	USD
CY2014Q4	us-gaap	Other Receivables OtherReceivables	1227000000	USD
CY2015Q4	us-gaap	Other Receivables OtherReceivables	912000000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-112000000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	88000000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	119000000	USD
CY2015Q4	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4000000	USD
CY2015	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	-22000000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1249000000	USD
CY2013	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	4450000000	USD
CY2014	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	7551000000	USD
CY2015	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	7147000000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1065000000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1105000000	USD
CY2013	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	0	USD
CY2014	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	421000000	USD
CY2015	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	0	USD
CY2015	us-gaap	Payments Of Merger Related Costs Financing Activities PaymentsOfMergerRelatedCostsFinancingActivities	138000000	USD
CY2013	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2014	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	386000000	USD
CY2015	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	40000000	USD
CY2013	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	4000000	USD
CY2014	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	3000000	USD
CY2015	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5395000000	USD
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6077000000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7624000000	USD
CY2013	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	422000000	USD
CY2014	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	617000000	USD
CY2015	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	502000000	USD
CY2013	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	825000000	USD
CY2014	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	560000000	USD
CY2015	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	637000000	USD
CY2015Q4	us-gaap	Plant Held For Future Use Amount PlantHeldForFutureUseAmount	57000000	USD
CY2014	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	13000000	USD
CY2014Q4	us-gaap	Preferred Stock Value PreferredStockValue	193000000	USD
CY2015Q4	us-gaap	Preferred Stock Value PreferredStockValue	193000000	USD
CY2014	us-gaap	Prescription Drug Benefit Effect Of Subsidy On Net Periodic Postretirement Benefit Cost1 PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost1	0	USD
CY2015	us-gaap	Prescription Drug Benefit Effect Of Subsidy On Net Periodic Postretirement Benefit Cost1 PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost1	0	USD
CY2013	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2013	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	115000000	USD
CY2014	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	13000000	USD
CY2015	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2014	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1868000000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2055000000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3463000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	6709000000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-119000000	USD
CY2014	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-178000000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-67000000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	332000000	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	122000000	USD
CY2014	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	7000000	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2013	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	47000000	USD
CY2014	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	35000000	USD
CY2015	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	32000000	USD
CY2013	us-gaap	Profit Loss ProfitLoss	1729000000	USD
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	80000000	USD
CY2013	us-gaap	Proceeds From Repurchase Of Redeemable Preferred Stock ProceedsFromRepurchaseOfRedeemablePreferredStock	-93000000	USD
CY2014	us-gaap	Proceeds From Repurchase Of Redeemable Preferred Stock ProceedsFromRepurchaseOfRedeemablePreferredStock	0	USD
CY2015	us-gaap	Proceeds From Repurchase Of Redeemable Preferred Stock ProceedsFromRepurchaseOfRedeemablePreferredStock	0	USD
CY2013	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	4217000000	USD
CY2014	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	7396000000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	6895000000	USD
CY2013	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	22000000	USD
CY2014	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	7000000	USD
CY2015	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	0	USD
CY2013	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	32000000	USD
CY2014	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	1719000000	USD
CY2015	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	147000000	USD
CY2013	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	19000000	USD
CY2014Q1	us-gaap	Profit Loss ProfitLoss	90000000	USD
CY2014Q2	us-gaap	Profit Loss ProfitLoss	522000000	USD
CY2014Q3	us-gaap	Profit Loss ProfitLoss	993000000	USD
CY2014Q4	us-gaap	Profit Loss ProfitLoss	18000000	USD
CY2014	us-gaap	Profit Loss ProfitLoss	1820000000	USD
CY2015Q1	us-gaap	Profit Loss ProfitLoss	693000000	USD
CY2015Q2	us-gaap	Profit Loss ProfitLoss	638000000	USD
CY2015Q3	us-gaap	Profit Loss ProfitLoss	629000000	USD
CY2015Q4	us-gaap	Profit Loss ProfitLoss	309000000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	2250000000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	66912000000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	73814000000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	52170000000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	57439000000	USD
CY2013	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	101000000	USD
CY2014	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	156000000	USD
CY2015	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	120000000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	22000000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	21000000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	24000000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	35000000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	37000000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	44000000	USD
CY2013	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	-341000000	USD
CY2014	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	-232000000	USD
CY2015Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	759000000	USD
CY2014Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	6076000000	USD
CY2015Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	6065000000	USD
CY2015	us-gaap	Public Utilities Approved Rate Increase Decrease Amount PublicUtilitiesApprovedRateIncreaseDecreaseAmount	67000000	USD
CY2013	us-gaap	Public Utilities Requested Rate Increase Decrease Amount PublicUtilitiesRequestedRateIncreaseDecreaseAmount	353000000	USD
CY2014	us-gaap	Public Utilities Requested Rate Increase Decrease Amount PublicUtilitiesRequestedRateIncreaseDecreaseAmount	269000000	USD
CY2015	us-gaap	Public Utilities Requested Rate Increase Decrease Amount PublicUtilitiesRequestedRateIncreaseDecreaseAmount	-50000000	USD
CY2013	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	302000000	USD
CY2014	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	396000000	USD
CY2015	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	407000000	USD
CY2014	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	116000000	USD
CY2015	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-196000000	USD
CY2014Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	0	USD
CY2015Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	28000000	USD
CY2015Q4	us-gaap	Redemption Premium RedemptionPremium	9000000	USD
CY2013	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	10611000000	USD
CY2014	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	10792000000	USD
CY2015	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	11052000000	USD
CY2014Q4	us-gaap	Regulatory Assets RegulatoryAssets	6923000000	USD
CY2015Q4	us-gaap	Regulatory Assets RegulatoryAssets	6824000000	USD
CY2014Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	847000000	USD
CY2014Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4860000000	USD
CY2015Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4570000000	USD
CY2014Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	310000000	USD
CY2015Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	369000000	USD
CY2014Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4550000000	USD
CY2015Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4201000000	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1589000000	USD
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1545000000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2687000000	USD
CY2013	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	210000000	USD
CY2014	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	0	USD
CY2015	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	0	USD
CY2014Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	271000000	USD
CY2015Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	205000000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	10910000000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	12068000000	USD
CY2013	us-gaap	Revenue From Purchased Oil And Gas RevenueFromPurchasedOilAndGas	1721000000	USD
CY2014	us-gaap	Revenue From Purchased Oil And Gas RevenueFromPurchasedOilAndGas	2704000000	USD
CY2015	us-gaap	Revenue From Purchased Oil And Gas RevenueFromPurchasedOilAndGas	2433000000	USD
CY2013	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	70000000	USD
CY2014	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	23000000	USD
CY2015	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	9000000	USD
CY2013	us-gaap	Revenues Revenues	24888000000	USD
CY2014Q1	us-gaap	Revenues Revenues	7237000000	USD
CY2014Q2	us-gaap	Revenues Revenues	6024000000	USD
CY2014Q3	us-gaap	Revenues Revenues	6912000000	USD
CY2014Q4	us-gaap	Revenues Revenues	7255000000	USD
CY2014	us-gaap	Revenues Revenues	27429000000	USD
CY2015Q1	us-gaap	Revenues Revenues	8830000000	USD
CY2015Q2	us-gaap	Revenues Revenues	6514000000	USD
CY2015Q3	us-gaap	Revenues Revenues	7401000000	USD
CY2015Q4	us-gaap	Revenues Revenues	6702000000	USD
CY2015	us-gaap	Revenues Revenues	29447000000	USD
CY2015Q2	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	32.48
CY2013	us-gaap	Sales Revenue Services Gross SalesRevenueServicesGross	14000000	USD
CY2014	us-gaap	Sales Revenue Services Gross SalesRevenueServicesGross	6000000	USD
CY2015	us-gaap	Sales Revenue Services Gross SalesRevenueServicesGross	5000000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	120000000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	91000000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	97000000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0528
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0130
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.2320
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4000000	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3000000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	0	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	4.18
CY2014Q1	us-gaap	Share Price SharePrice	33.56
CY2014Q2	us-gaap	Share Price SharePrice	36.48
CY2014Q3	us-gaap	Share Price SharePrice	34.09
CY2014Q4	us-gaap	Share Price SharePrice	37.08
CY2015Q1	us-gaap	Share Price SharePrice	33.61
CY2015Q2	us-gaap	Share Price SharePrice	31.42
CY2015Q3	us-gaap	Share Price SharePrice	29.7
CY2015Q4	us-gaap	Share Price SharePrice	27.77
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y3M
CY2012Q4	us-gaap	Shares Issued SharesIssued	889525000	shares
CY2013Q4	us-gaap	Shares Issued SharesIssued	892034000	shares
CY2014Q4	us-gaap	Shares Issued SharesIssued	894568000	shares
CY2015Q4	us-gaap	Shares Issued SharesIssued	954668000	shares
CY2015Q2	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	35
CY2014Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	460000000	USD
CY2015Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	533000000	USD
CY2014Q4	us-gaap	Spent Nuclear Fuel Obligation Noncurrent SpentNuclearFuelObligationNoncurrent	1021000000	USD
CY2015Q4	us-gaap	Spent Nuclear Fuel Obligation Noncurrent SpentNuclearFuelObligationNoncurrent	1021000000	USD
CY2014	us-gaap	Stock Issued1 StockIssued1	131000000	USD
CY2013	us-gaap	Stock Issued During Period Shares Acquisitions StockIssuedDuringPeriodSharesAcquisitions	0	shares
CY2013	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	1064000	shares
CY2014	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	960000	shares
CY2015	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	1170000	shares
CY2015	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	57500000	shares
CY2013	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	-63000000	USD
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	28000000	USD
CY2014	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	35000000	USD
CY2015	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	32000000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1868000000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	22608000000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	25793000000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	21730000000	USD
CY2013Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	22940000000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	24133000000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	27294000000	USD
CY2015	us-gaap	Subsidiary Or Equity Method Investee Cumulative Percentage Ownership After All Transactions SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions	1
CY2015	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	24000000	USD
CY2013	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1095000000	USD
CY2014	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1154000000	USD
CY2015	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1200000000	USD
CY2013	us-gaap	Taxes Other TaxesOther	185000000	USD
CY2014	us-gaap	Taxes Other TaxesOther	102000000	USD
CY2015	us-gaap	Taxes Other TaxesOther	118000000	USD
CY2014Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	305000000	USD
CY2015Q1	us-gaap	Taxes Payable Current TaxesPayableCurrent	65000000	USD
CY2015Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	293000000	USD
CY2015	us-gaap	Temporary Equity Other Changes TemporaryEquityOtherChanges	4000000	USD
CY2015Q2	us-gaap	Temporary Equity Share Subscriptions TemporaryEquityShareSubscriptions	57500000	shares
CY2015Q4	us-gaap	Treasury Stock Number Of Shares Held TreasuryStockNumberOfSharesHeld	35000000	shares
CY2014Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	35000000	shares
CY2015Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	35000000	shares
CY2014Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2327000000	USD
CY2015Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2300000000	USD
CY2015Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2327000000	USD
CY2014Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	150000000	USD
CY2015Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	180000000	USD
CY2014Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	1381000000	USD
CY2015Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	1203000000	USD
CY2013	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	445000000	USD
CY2014	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-716000000	USD
CY2015	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	367000000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1024000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2175000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1829000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1078000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	6000000	USD
CY2014Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets VariableInterestEntityNonconsolidatedCarryingAmountAssets	205000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	88000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	86000000	USD
CY2014Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	8848000000	USD
CY2015Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	8918000000	USD
CY2014Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	3339000000	USD
CY2015Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	3400000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	116000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	35000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	31000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	90000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	19000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	15000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	108000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	493000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	18000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	79000000	USD
CY2014Q1	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	265000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	4000000	USD
CY2015Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets VariableInterestEntityNonconsolidatedCarryingAmountAssets	427000000	USD
CY2014Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Liabilities VariableInterestEntityNonconsolidatedCarryingAmountLiabilities	52000000	USD
CY2015Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Liabilities VariableInterestEntityNonconsolidatedCarryingAmountLiabilities	147000000	USD
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	860000000	shares
CY2014Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	861000000	shares
CY2014Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	864000000	shares
CY2014Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	863000000	shares
CY2014Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	868000000	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	864000000	shares
CY2015Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	867000000	shares
CY2015Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	866000000	shares
CY2015Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	915000000	shares
CY2015Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	924000000	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	893000000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	856000000	shares
CY2014Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	858000000	shares
CY2014Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	860000000	shares
CY2014Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	861000000	shares
CY2014Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	861000000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	860000000	shares
CY2015Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	862000000	shares
CY2015Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	863000000	shares
CY2015Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	913000000	shares
CY2015Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	921000000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	890000000	shares
CY2015Q4	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	9000000	USD
CY2015	exc	Scheduleofjointlyownedelectricutilityplanttextblock Scheduleofjointlyownedelectricutilityplanttextblock	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;"> (Exelon, Generation, PECO and BGE)</font></div><div style="line-height:120%;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div><div style="line-height:120%;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">Exelon, Generation, PECO and BGE’s undivided ownership interests in jointly owned electric plants and transmission facilities at </font><font style="font-family:Arial;font-size:10pt;">December 31, 2015</font><font style="font-family:Arial;font-size:10pt;"> and </font><font style="font-family:Arial;font-size:10pt;">2014</font><font style="font-family:Arial;font-size:10pt;"> were as follows:</font></div><div style="line-height:120%;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="32" rowspan="1"></td></tr><tr><td width="21%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="7%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="7%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="7%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="8%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="7%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="7%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="7%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="6%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="15" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Nuclear Generation</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Fossil Fuel Generation</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="7" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Transmission</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Other</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Quad Cities</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Peach</font></div><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Bottom</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Salem </font><font style="font-family:Arial;font-size:7pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(a)</sup></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Nine Mile Point Unit 2</font><font style="font-family:Arial;font-size:7pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(f)</sup></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Wyman</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">PA </font><font style="font-family:Arial;font-size:7pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(b)</sup></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">DE/NJ </font><font style="font-family:Arial;font-size:7pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(c)</sup></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Other </font><font style="font-family:Arial;font-size:7pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(d)</sup></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Operator</font></div></td><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Generation</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Generation</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">PSEG</font></div><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Nuclear</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Generation</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">FP&L</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">First</font></div><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Energy</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">PSEG</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Ownership interest</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">75.00</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">%</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">50.00</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">%</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">42.59</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">%</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">82.00</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">%</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">5.89</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">%</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Various</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">42.55</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">%</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">44.24</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">%</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Exelon’s share at December 31, 2015:</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Plant </font><font style="font-family:Arial;font-size:7pt;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(e)</sup></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">1,035</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">1,345</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">566</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">756</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">3</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">15</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">65</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">1</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Accumulated </font></div><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">   depreciation </font><font style="font-family:Arial;font-size:7pt;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(e)</sup></font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">309</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">368</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">167</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">42</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">3</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">7</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">35</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">1</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Construction work</font></div><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">   in progress</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">11</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">18</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">40</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">56</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;font-weight:bold;">Exelon’s share at December 31, 2014:</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Plant </font><font style="font-family:Arial;font-size:7pt;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(e)</sup></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">995</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">1,095</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">531</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:middle;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">676</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">3</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">14</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">64</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">2</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Accumulated depreciation </font><font style="font-family:Arial;font-size:7pt;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(e)</sup></font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">266</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">343</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">150</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">14</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">3</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">7</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">34</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">1</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">Construction work</font></div><div style="text-align:left;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">   in progress</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">15</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">133</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">29</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">48</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:7pt;"><font style="font-family:Arial;font-size:7pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div></div><div style="line-height:120%;font-size:7.5pt;"><font style="font-family:inherit;font-size:7.5pt;">________________________</font></div><table cellpadding="0" cellspacing="0" style="padding-top:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:7.5pt;padding-left:0px;"><font style="font-family:Arial;font-size:7.5pt;">(a)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:7.5pt;"><font style="font-family:Arial;font-size:7.5pt;">Generation also owns a proportionate share in the fossil fuel combustion turbine at Salem, which is fully depreciated. The gross book value was </font><font style="font-family:Arial;font-size:7.5pt;">$3 million</font><font style="font-family:Arial;font-size:7.5pt;"> at </font><font style="font-family:Arial;font-size:7.5pt;">December 31, 2015</font><font style="font-family:Arial;font-size:7.5pt;"> and </font><font style="font-family:Arial;font-size:7.5pt;">2014</font><font style="font-family:Arial;font-size:7.5pt;">.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:7.5pt;padding-left:0px;"><font style="font-family:Arial;font-size:7.5pt;">(b)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:7.5pt;"><font style="font-family:Arial;font-size:7.5pt;">PECO and BGE own a </font><font style="font-family:Arial;font-size:7.5pt;">22%</font><font style="font-family:Arial;font-size:7.5pt;"> and </font><font style="font-family:Arial;font-size:7.5pt;">7%</font><font style="font-family:Arial;font-size:7.5pt;"> share, respectively, in </font><font style="font-family:Arial;font-size:7.5pt;">127</font><font style="font-family:Arial;font-size:7.5pt;"> miles of </font><font style="font-family:Arial;font-size:7.5pt;">500</font><font style="font-family:Arial;font-size:7.5pt;">kV lines located in Pennsylvania; PECO and BGE also own a </font><font style="font-family:Arial;font-size:7.5pt;">20.7%</font><font style="font-family:Arial;font-size:7.5pt;"> and </font><font style="font-family:Arial;font-size:7.5pt;">10.56%</font><font style="font-family:Arial;font-size:7.5pt;"> share, respectively, of a </font><font style="font-family:Arial;font-size:7.5pt;">500</font><font style="font-family:Arial;font-size:7.5pt;">kV substation immediately outside of the Conemaugh fossil generating station which supplies power to the </font><font style="font-family:Arial;font-size:7.5pt;">500</font><font style="font-family:Arial;font-size:7.5pt;">kV lines including, but not limited to, the lines noted above.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:7.5pt;padding-left:0px;"><font style="font-family:Arial;font-size:7.5pt;">(c)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:7.5pt;"><font style="font-family:Arial;font-size:7.5pt;">PECO owns a </font><font style="font-family:Arial;font-size:7.5pt;">42.55%</font><font style="font-family:Arial;font-size:7.5pt;"> share in </font><font style="font-family:Arial;font-size:7.5pt;">131</font><font style="font-family:Arial;font-size:7.5pt;"> miles of </font><font style="font-family:Arial;font-size:7.5pt;">500</font><font style="font-family:Arial;font-size:7.5pt;">kV lines located in Delaware and New Jersey as well as a </font><font style="font-family:Arial;font-size:7.5pt;">42.55%</font><font style="font-family:Arial;font-size:7.5pt;"> share in a </font><font style="font-family:Arial;font-size:7.5pt;">500</font><font style="font-family:Arial;font-size:7.5pt;">kV substation immediately outside of the Salem nuclear generating station in New Jersey which supplies power to the </font><font style="font-family:Arial;font-size:7.5pt;">500</font><font style="font-family:Arial;font-size:7.5pt;">kV lines including, but not limited to, the lines noted above.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:7.5pt;padding-left:0px;"><font style="font-family:Arial;font-size:7.5pt;">(d)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:7.5pt;"><font style="font-family:Arial;font-size:7.5pt;">Generation has a </font><font style="font-family:Arial;font-size:7.5pt;">44.24%</font><font style="font-family:Arial;font-size:7.5pt;"> ownership interest in assets located at Merrill Creek Reservoir located in New Jersey.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:7.5pt;padding-left:0px;"><font style="font-family:Arial;font-size:7.5pt;">(e)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:7.5pt;"><font style="font-family:Arial;font-size:7.5pt;">Excludes asset retirement costs.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:7.5pt;padding-left:0px;"><font style="font-family:Arial;font-size:7.5pt;">(f)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:7.5pt;"><font style="font-family:Arial;font-size:7.5pt;">On April 1, 2014, Generation assumed operational control of CENG's nuclear fleet, and as of that date, CENG’s operations are consolidated into Generation’s financial statements. As of </font><font style="font-family:Arial;font-size:7.5pt;">December 31, 2013</font><font style="font-family:Arial;font-size:7.5pt;">, Generation’s ownership interest in CENG, including Nine Mile Point, was treated as an equity method investment, and thus did not represent an undivided Interest. See Note </font><font style="font-family:Arial;font-size:7.5pt;">5</font><font style="font-family:Arial;font-size:7.5pt;"> - </font><font style="font-family:Arial;font-size:7.5pt;">Investment in Constellation Energy Nuclear Group, LLC</font><font style="font-family:Arial;font-size:7.5pt;"> for additional information.</font></div></td></tr></table><div style="line-height:120%;text-align:justify;padding-left:24px;text-indent:-24px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">Exelon’s, Generation’s, PECO’s and BGE’s undivided ownership interests are financed with their funds and all operations are accounted for as if such participating interests were wholly-owned facilities. Exelon’s, Generation’s, PECO’s and BGE’s share of direct expenses of the jointly owned plants are included in Purchased power and fuel and Operating and maintenance expenses on Exelon’s and Generation’s Consolidated Statements of Operations and Comprehensive Income and in Operating and maintenance expenses on PECO’s and BGE’s Consolidated Statements of Operations and Comprehensive Income.</font></div></div>
CY2015	us-gaap	Guarantees Indemnifications And Warranties Policies GuaranteesIndemnificationsAndWarrantiesPolicies	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">Guarantees (Exelon, Generation, ComEd, PECO and BGE)</font></div><div style="line-height:120%;text-align:justify;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div><div style="line-height:120%;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">The Registrants recognize, at the inception of a guarantee, a liability for the fair market value of the obligations they have undertaken by issuing the guarantee, including the ongoing obligation to perform over the term of the guarantee in the event that the specified triggering events or conditions occur.</font></div><div style="line-height:120%;text-align:justify;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div><div style="line-height:120%;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">The liability that is initially recognized at the inception of the guarantee is reduced as the Registrants are released from risk under the guarantee. Depending on the nature of the guarantee, the release from risk of the Registrant may be recognized only upon the expiration or settlement of the guarantee or by a systematic and rational amortization method over the term of the guarantee. See Note </font><font style="font-family:Arial;font-size:10pt;">23</font><font style="font-family:Arial;font-size:10pt;"> — </font><font style="font-family:Arial;font-size:10pt;">Commitments and Contingencies</font><font style="font-family:Arial;font-size:10pt;"> for additional information.</font></div></div>
CY2015	us-gaap	Reclassifications Reclassifications	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">Reclassifications (Exelon, Generation, ComEd, PECO and BGE)</font></div><div style="line-height:120%;text-align:justify;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div><div style="line-height:120%;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">Certain prior year amounts in the registrants' Consolidated Statements of Operations and Comprehensive Income, Consolidated Balance Sheets and Consolidated Statements of Cash Flows have been reclassified between line items for comparative purposes. The reclassifications did not affect any of the Registrants’ net income, financial positions, or cash flows from operating activities.</font></div><div style="line-height:120%;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">Exelon revised the presentation on the Statements of Operations and Comprehensive Income for PECO and BGE to reflect separately operating revenues from the sale of electricity and operating revenues from the sale of natural gas, as well as, purchased power expense and purchased fuel expense within the operating expenses section of the Statement of Operations and Comprehensive Income. Further, Exelon revised the presentation from total operating revenues to "Rate-regulated utility revenues" and "Competitive businesses revenues" on the face of Exelon’s consolidated Statement of Operations and Comprehensive Income for all periods presented. Similarly, Exelon will separately present rate-regulated purchased power and fuel expense and non-rate regulated purchased power and fuel expense on the face of Exelon’s consolidated Statement of Operations and Comprehensive Income for all periods presented.  The reclassifications described herein were made for presentation purposes and did not affect any of the Registrants’ total revenues or net income.</font></div><div style="line-height:120%;text-align:justify;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"><br clear="none"/></font></div></div>
CY2015	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">Use of Estimates (Exelon, Generation, ComEd, PECO and BGE)</font></div><div style="line-height:120%;text-align:justify;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div><div style="line-height:120%;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">The preparation of financial statements of each of the Registrants in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Areas in which significant estimates have been made include, but are not limited to, the accounting for nuclear decommissioning costs and other AROs, pension and other postretirement benefits, the application of purchase accounting, inventory reserves, allowance for uncollectible accounts, goodwill and asset impairments, derivative instruments, unamortized energy contracts, fixed asset depreciation, environmental costs and other loss contingencies, taxes and unbilled energy revenues. Actual results could differ from those estimates.</font></div></div>

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$EXC
EXELON CORP Stock $exc

2015 Q4 Form 10-K Financial Statement

#000119312516457652 Filed on February 10, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EXC EXELON CORP Stock $exc

2015 Q4 Form 10-K Financial Statement

#000119312516457652 Filed on February 10, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EXC
EXELON CORP Stock $exc