$EXC
EXELON CORP Stock $exc

$exc Overview Financials Valuation SEC Filings Company Website

2011 Q3 Form 10-Q Financial Statement

#000119312511281748 Filed on October 26, 2011

Income Statement

Concept	2011 Q3	2010 Q3
Revenue	$5.254B	$5.291B
YoY Change	-0.7%	21.94%
Cost Of Revenue	$2.121B	$1.481B
YoY Change	43.21%	86.06%
Gross Profit	$3.133B	$3.810B
YoY Change	-17.77%	7.54%
Gross Profit Margin	59.63%	72.01%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$319.0M	$288.0M
YoY Change	10.76%	19.01%
% of Gross Profit	10.18%	7.56%
Operating Expenses	$1.952B	$2.444B
YoY Change	-20.13%	13.94%
Operating Profit	$1.181B	$1.367B
YoY Change	-13.61%	-2.57%
Interest Expense	$176.0M	$169.0M
YoY Change	4.14%	-0.59%
% of Operating Profit	14.9%	12.36%
Other Income/Expense, Net	-$324.0M	$31.00M
YoY Change	-1145.16%	-164.58%
Pretax Income	$857.0M	$1.397B
YoY Change	-38.65%	3.1%
Income Tax	$255.0M	$552.0M
% Of Pretax Income	29.75%	39.51%
Net Earnings	$601.0M	$845.0M
YoY Change	-28.88%	11.62%
Net Earnings / Revenue	11.44%	15.97%
Basic Earnings Per Share	$0.91	$1.28
Diluted Earnings Per Share	$0.90	$1.27
COMMON SHARES
Basic Shares Outstanding	663.0M shares	662.0M shares
Diluted Shares Outstanding	665.0M shares	663.0M shares

Balance Sheet

Concept	2011 Q3	2010 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.071B	$2.735B
YoY Change	-60.84%	15.21%
Cash & Equivalents	$1.071B	$2.735B
Short-Term Investments
Other Short-Term Assets	$493.0M	$388.0M
YoY Change	27.06%	-55.76%
Inventory	$851.0M	$809.0M
Prepaid Expenses
Receivables	$1.685B	$1.816B
Other Receivables	$930.0M	$464.0M
Total Short-Term Assets	$6.287B	$6.760B
YoY Change	-7.0%	14.67%
LONG-TERM ASSETS
Property, Plant & Equipment	$31.88B	$28.55B
YoY Change	11.66%	7.13%
Goodwill	$2.625B	$2.625B
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments	$754.0M	$728.0M
YoY Change	3.57%	-0.55%
Other Assets	$938.0M	$604.0M
YoY Change	55.3%	-95.56%
Total Long-Term Assets	$47.87B	$44.19B
YoY Change	8.33%	1.33%
TOTAL ASSETS
Total Short-Term Assets	$6.287B	$6.760B
Total Long-Term Assets	$47.87B	$44.19B
Total Assets	$54.16B	$50.95B
YoY Change	6.3%	2.92%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.388B	$1.056B
YoY Change	31.44%	-1.77%
Accrued Expenses	$1.053B	$1.203B
YoY Change	-12.47%	35.47%
Deferred Revenue
YoY Change
Short-Term Debt	$462.0M	$65.00M
YoY Change	610.77%	-53.57%
Long-Term Debt Due	$1.239B	$553.0M
YoY Change	124.05%	-62.23%
Total Short-Term Liabilities	$4.977B	$3.967B
YoY Change	25.46%	-10.73%
LONG-TERM LIABILITIES
Long-Term Debt	$12.18B	$11.66B
YoY Change	4.4%	1.43%
Other Long-Term Liabilities	$1.253B	$1.103B
YoY Change	13.6%	-92.75%
Total Long-Term Liabilities	$13.43B	$12.77B
YoY Change	5.19%	-52.21%
TOTAL LIABILITIES
Total Short-Term Liabilities	$4.977B	$3.967B
Total Long-Term Liabilities	$13.43B	$12.77B
Total Liabilities	$39.71B	$36.91B
YoY Change	7.6%	-0.29%
SHAREHOLDERS EQUITY
Retained Earnings	$10.15B	$9.128B
YoY Change	11.15%
Common Stock	$9.077B	$8.982B
YoY Change	1.06%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.327B	$2.327B
YoY Change	0.0%
Treasury Stock Shares	35.00M shares	35.00M shares
Shareholders Equity	$14.36B	$13.96B
YoY Change
Total Liabilities & Shareholders Equity	$54.16B	$50.95B
YoY Change	6.3%	2.92%

Cashflow Statement

Concept	2011 Q3	2010 Q3
OPERATING ACTIVITIES
Net Income	$601.0M	$845.0M
YoY Change	-28.88%	11.62%
Depreciation, Depletion And Amortization	$319.0M	$288.0M
YoY Change	10.76%	19.01%
Cash From Operating Activities	$1.904B	$1.743B
YoY Change	9.24%	10.18%
INVESTING ACTIVITIES
Capital Expenditures	-$987.0M	-$798.0M
YoY Change	23.68%	-1.24%
Acquisitions
YoY Change
Other Investing Activities	-$970.0M	$419.0M
YoY Change	-331.5%	-1496.67%
Cash From Investing Activities	-$1.957B	-$379.0M
YoY Change	416.36%	-54.77%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	562.0M	203.0M
YoY Change	176.85%	-197.6%
NET CHANGE
Cash From Operating Activities	1.904B	1.743B
Cash From Investing Activities	-1.957B	-379.0M
Cash From Financing Activities	562.0M	203.0M
Net Change In Cash	509.0M	1.567B
YoY Change	-67.52%	192.35%
FREE CASH FLOW
Cash From Operating Activities	$1.904B	$1.743B
Capital Expenditures	-$987.0M	-$798.0M
Free Cash Flow	$2.891B	$2.541B
YoY Change	13.77%	6.32%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	703000000	USD
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	dei	Document Type DocumentType	10-Q
	dei	Document Period End Date DocumentPeriodEndDate	2011-09-30
	dei	Amendment Flag AmendmentFlag	false
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	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	172000000	USD
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CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2423000000	USD
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CY2011Q3	exc	Minimum Ghg Emissions Required For Eligibility For Stationary Source Permitting MinimumGhgEmissionsRequiredForEligibilityForStationarySourcePermitting	100000	Tons
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CY2011Q3	us-gaap	Profit Loss ProfitLoss	601000000	USD
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	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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CY2011Q3	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Net Of Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentNetOfTax	0	USD
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-64000000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-31000000	USD
CY2011Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	570000000	USD
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	663000000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	665000000	shares
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.91
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.90
CY2011Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.53
CY2010Q3	us-gaap	Revenues Revenues	5291000000	USD
CY2010Q3	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	1481000000	USD
CY2010Q3	us-gaap	Fuel Costs FuelCosts	475000000	USD
CY2010Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1122000000	USD
CY2010Q3	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	578000000	USD
CY2010Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	232000000	USD
CY2010Q3	us-gaap	Costs And Expenses CostsAndExpenses	3925000000	USD
CY2010Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	1366000000	USD
CY2010Q3	us-gaap	Interest Expense InterestExpense	169000000	USD
CY2010Q3	exc	Interest Expense To Affiliates Net InterestExpenseToAffiliatesNet	6000000	USD
CY2010Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2010Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	206000000	USD
CY2010Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	31000000	USD
CY2010Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1397000000	USD
CY2010Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	552000000	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	845000000	USD
CY2010Q3	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	3000000	USD
CY2010Q3	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	24000000	USD
CY2010Q3	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plan Net Transition Asset Obligation Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax	0	USD
CY2010Q3	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Net Of Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentNetOfTax	-2000000	USD
CY2010Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	222000000	USD
CY2010Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2010Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	251000000	USD
CY2010Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1096000000	USD
CY2010Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	662000000	shares
CY2010Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	663000000	shares
CY2010Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.28
CY2010Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2010Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.53
	us-gaap	Revenues Revenues	14150000000	USD
	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	3273000000	USD
	us-gaap	Fuel Costs FuelCosts	1469000000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3298000000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	1611000000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	615000000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	10364000000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	3786000000	USD
	us-gaap	Interest Expense InterestExpense	615000000	USD
	exc	Interest Expense To Affiliates Net InterestExpenseToAffiliatesNet	19000000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	178000000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-456000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	3330000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1291000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2039000000	USD
	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-8000000	USD
	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	86000000	USD
	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plan Net Transition Asset Obligation Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax	5000000	USD
	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Net Of Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentNetOfTax	18000000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	196000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	261000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2300000000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	661000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	662000000	shares
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.08
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.08
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.58
	us-gaap	Revenues Revenues	14933000000	USD
	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	4602000000	USD
	us-gaap	Fuel Costs FuelCosts	1462000000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3725000000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	987000000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	602000000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	11516000000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	3417000000	USD
	us-gaap	Interest Expense InterestExpense	526000000	USD
	exc	Interest Expense To Affiliates Net InterestExpenseToAffiliatesNet	19000000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	51000000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-494000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	2923000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1034000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	1889000000	USD
	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-3000000	USD
	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	100000000	USD
	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plan Net Transition Asset Obligation Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax	2000000	USD
	exc	Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Net Of Tax OtherComprehensiveIncomePensionAndNonPensionPostretirementBenefitPlanValuationAdjustmentNetOfTax	-39000000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-255000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-117000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1772000000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	663000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	664000000	shares
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.85
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.84
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.58
CY2011Q3	exc	Other Cost And Expense Operating Regulatory Required Programs OtherCostAndExpenseOperatingRegulatoryRequiredPrograms	59000000	USD
CY2010Q3	exc	Other Cost And Expense Operating Regulatory Required Programs OtherCostAndExpenseOperatingRegulatoryRequiredPrograms	37000000	USD
	exc	Other Cost And Expense Operating Regulatory Required Programs OtherCostAndExpenseOperatingRegulatoryRequiredPrograms	138000000	USD
	exc	Other Cost And Expense Operating Regulatory Required Programs OtherCostAndExpenseOperatingRegulatoryRequiredPrograms	98000000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	806000000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	0	USD
CY2011Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	4381000000	USD
CY2010Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	487000000	USD
CY2011Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	478000000	USD
CY2010Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	38000000	USD
CY2010Q4	us-gaap	Temporary Equity Carrying Amount TemporaryEquityCarryingAmount	87000000	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	9006000000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	13560000000	USD
CY2011Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	52000000	USD
CY2011Q3	us-gaap	Other Notes Payable Current OtherNotesPayableCurrent	225000000	USD
CY2011Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	1239000000	USD
CY2011Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	1388000000	USD
CY2011Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1053000000	USD
CY2011Q3	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2011Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	498000000	USD
CY2011Q3	us-gaap	Liabilities Current LiabilitiesCurrent	4977000000	USD
CY2011Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	12175000000	USD
CY2011Q3	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	390000000	USD
CY2011Q3	exc	Deferred Income Taxes And Unamortized Investment Tax Credits DeferredIncomeTaxesAndUnamortizedInvestmentTaxCredits	7958000000	USD
CY2011Q3	us-gaap	Temporary Equity Carrying Amount TemporaryEquityCarryingAmount	87000000	USD
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2327000000	USD
CY2011Q3	us-gaap	Treasury Stock Value TreasuryStockValue	2327000000	USD
CY2011Q3	exc	Consolidated Subsidiary Ownership Percentage ConsolidatedSubsidiaryOwnershipPercentage	1	pure
CY2011Q3	us-gaap	Minority Interest Ownership Percentage By Parent MinorityInterestOwnershipPercentageByParent	0.99	pure
CY2011Q3	exc	Consolidated Subsidiary Common Stock Ownership Percentage ConsolidatedSubsidiaryCommonStockOwnershipPercentage	1	pure
CY2011Q3	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.01	pure
CY2011Q3	exc	Minority Interest Upper Bound MinorityInterestUpperBound	1000000	USD
CY2011Q3	exc	Electric Supply Costs Over Recovery ElectricSupplyCostsOverRecovery	-19000000	USD
CY2011Q3	exc	Electric Supply Costs Under Recovery ElectricSupplyCostsUnderRecovery	0	USD
CY2011Q3	exc	Transmission Costs Under Recovery TransmissionCostsUnderRecovery	0	USD
CY2011Q3	us-gaap	Regulatory Assets RegulatoryAssets	4412000000	USD
CY2011Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	3661000000	USD
CY2010Q4	us-gaap	Regulatory Assets RegulatoryAssets	4150000000	USD
CY2010Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	3599000000	USD
CY2011Q3	exc	Other Cost And Expense Operating Energy Efficiency And Demand Response Programs OtherCostAndExpenseOperatingEnergyEfficiencyAndDemandResponsePrograms	52000000	USD
CY2011Q3	exc	Other Cost And Expense Operating Advanced Metering Infrastructure Pilot Program OtherCostAndExpenseOperatingAdvancedMeteringInfrastructurePilotProgram	3000000	USD
CY2011Q3	exc	Other Cost And Expense Operating Purchased Power Administrative Costs OtherCostAndExpenseOperatingPurchasedPowerAdministrativeCosts	3000000	USD
CY2011Q3	exc	Other Cost And Expense Operating Consumer Education Costs OtherCostAndExpenseOperatingConsumerEducationCosts	1000000	USD
	exc	Other Cost And Expense Operating Energy Efficiency And Demand Response Programs OtherCostAndExpenseOperatingEnergyEfficiencyAndDemandResponsePrograms	122000000	USD
	exc	Other Cost And Expense Operating Advanced Metering Infrastructure Pilot Program OtherCostAndExpenseOperatingAdvancedMeteringInfrastructurePilotProgram	7000000	USD
	exc	Other Cost And Expense Operating Purchased Power Administrative Costs OtherCostAndExpenseOperatingPurchasedPowerAdministrativeCosts	7000000	USD
	exc	Other Cost And Expense Operating Consumer Education Costs OtherCostAndExpenseOperatingConsumerEducationCosts	2000000	USD
CY2010Q3	exc	Other Cost And Expense Operating Energy Efficiency And Demand Response Programs OtherCostAndExpenseOperatingEnergyEfficiencyAndDemandResponsePrograms	35000000	USD
	exc	Other Cost And Expense Operating Energy Efficiency And Demand Response Programs OtherCostAndExpenseOperatingEnergyEfficiencyAndDemandResponsePrograms	93000000	USD
	exc	Other Cost And Expense Operating Purchased Power Administrative Costs OtherCostAndExpenseOperatingPurchasedPowerAdministrativeCosts	3000000	USD
	exc	Other Cost And Expense Operating Consumer Education Costs OtherCostAndExpenseOperatingConsumerEducationCosts	2000000	USD
CY2010Q3	exc	Other Cost And Expense Operating Purchased Power Administrative Costs OtherCostAndExpenseOperatingPurchasedPowerAdministrativeCosts	1000000	USD
CY2010Q3	exc	Other Cost And Expense Operating Consumer Education Costs OtherCostAndExpenseOperatingConsumerEducationCosts	1000000	USD
CY2011Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	414000000	USD
CY2011Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	10000000	USD
CY2011Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	404000000	USD
	us-gaap	Future Amortization Expense Year One FutureAmortizationExpenseYearOne	3000000	USD
	us-gaap	Future Amortization Expense Year Two FutureAmortizationExpenseYearTwo	31000000	USD
	us-gaap	Future Amortization Expense Year Three FutureAmortizationExpenseYearThree	53000000	USD
	us-gaap	Future Amortization Expense Year Four FutureAmortizationExpenseYearFour	38000000	USD
	us-gaap	Future Amortization Expense Year Five FutureAmortizationExpenseYearFive	31000000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	1473000000	USD
CY2011Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInEarnings	-8000000	USD
CY2011Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInOtherComprehensiveIncome	-15000000	USD
CY2011Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Regulatory Assets Liabilities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegulatoryAssetsLiabilities	-18000000	USD
CY2011Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossChangeInCollateral	8000000	USD
CY2011Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTransfersNet	24000000	USD
CY2011Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Total Gain Loss Included In Earnings Attributed To Changes In Unrealized Gains Losses FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTotalGainLossIncludedInEarningsAttributedToChangesInUnrealizedGainsLosses	-5000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInEarnings	0	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInOtherComprehensiveIncome	-27000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Regulatory Assets Liabilities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegulatoryAssetsLiabilities	-51000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossChangeInCollateral	15000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTransfersNet	-16000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Total Gain Loss Included In Earnings Attributed To Changes In Unrealized Gains Losses FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTotalGainLossIncludedInEarningsAttributedToChangesInUnrealizedGainsLosses	18000000	USD
CY2011Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInNuclearDecommissioningPayable	-3000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInNuclearDecommissioningPayable	0	USD
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	23000000	USD
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-10000000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	70000000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-22000000	USD
CY2011Q2	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityValue	18000000	USD
CY2011Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityValue	19000000	USD
CY2010Q4	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityValue	50000000	USD
CY2010Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInOtherComprehensiveIncome	30000000	USD
CY2010Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Regulatory Assets Liabilities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegulatoryAssetsLiabilities	14000000	USD
CY2010Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossChangeInCollateral	-14000000	USD
CY2010Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTransfersNet	3000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInEarnings	112000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInOtherComprehensiveIncome	21000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTransfersNet	26000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Total Gain Loss Included In Earnings Attributed To Changes In Unrealized Gains Losses FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTotalGainLossIncludedInEarningsAttributedToChangesInUnrealizedGainsLosses	112000000	USD
CY2010Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Total Gain Loss Included In Earnings Attributed To Changes In Unrealized Gains Losses FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTotalGainLossIncludedInEarningsAttributedToChangesInUnrealizedGainsLosses	34000000	USD
CY2010Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	16000000	USD
CY2010Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-1000000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	28000000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-1000000	USD
CY2010Q2	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityValue	68000000	USD
CY2009Q4	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityValue	-46000000	USD
CY2010Q3	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityValue	116000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Regulatory Assets Liabilities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegulatoryAssetsLiabilities	-2000000	USD
	exc	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossChangeInCollateral	-22000000	USD
CY2011Q3	exc	Total Deferred Debits And Other Assets TotalDeferredDebitsAndOtherAssets	15987000000	USD
CY2011Q3	us-gaap	Assets Assets	54156000000	USD
CY2011Q3	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	6226000000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	52240000000	USD
CY2011Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	462000000	USD
CY2011Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	3808000000	USD
CY2011Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	60000000	USD
CY2010Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	44000000	USD
CY2011Q3	exc	Payable To Zionsolutions PayableToZionsolutions	604000000	USD
	exc	Stock Issued During Period Value Long Term Incentive Plan Activity StockIssuedDuringPeriodValueLongTermIncentivePlanActivity	71000000	USD
CY2011Q3	exc	Intervenor Potential Refund Submitted In Testimony IntervenorPotentialRefundSubmittedInTestimony	37000000	USD
CY2011Q3	exc	Proceeds From Agreement Under Servicing Liability ProceedsFromAgreementUnderServicingLiability	225000000	USD
CY2011Q3	us-gaap	Notional Amount Of Interest Rate Fair Value Hedge Derivatives NotionalAmountOfInterestRateFairValueHedgeDerivatives	100000000	USD
CY2010Q4	us-gaap	Notional Amount Of Interest Rate Fair Value Hedge Derivatives NotionalAmountOfInterestRateFairValueHedgeDerivatives	100000000	USD
CY2011Q3	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	15000000	USD
CY2010Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	14000000	USD
CY2011Q3	exc	Affiliate Derivative Assets Current AffiliateDerivativeAssetsCurrent	0	USD
CY2011Q3	exc	Total Mark To Market Derivative Assets TotalMarkToMarketDerivativeAssets	778000000	USD
CY2011Q3	exc	Affiliate Derivative Assets Noncurrent AffiliateDerivativeAssetsNoncurrent	0	USD
CY2011Q3	exc	Total Mark To Market Derivative Liabilities TotalMarkToMarketDerivativeLiabilities	118000000	USD
CY2011Q3	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	660000000	USD
CY2011Q3	exc	Affiliate Derivative Liabilities Current AffiliateDerivativeLiabilitiesCurrent	0	USD
CY2011Q3	exc	Affiliate Derivative Liabilities Noncurrent AffiliateDerivativeLiabilitiesNoncurrent	0	USD
CY2011Q3	exc	Energy Derivative Assets Noncurrent EnergyDerivativeAssetsNoncurrent	300000000	USD
CY2011Q3	exc	Energy Derivative Liabilities Noncurrent EnergyDerivativeLiabilitiesNoncurrent	66000000	USD
CY2010Q4	exc	Total Mark To Market Derivative Assets TotalMarkToMarketDerivativeAssets	896000000	USD
CY2010Q4	exc	Total Mark To Market Derivative Liabilities TotalMarkToMarketDerivativeLiabilities	59000000	USD
CY2010Q4	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	837000000	USD
CY2010Q4	exc	Affiliate Derivative Assets Current AffiliateDerivativeAssetsCurrent	0	USD
CY2010Q4	exc	Affiliate Derivative Liabilities Noncurrent AffiliateDerivativeLiabilitiesNoncurrent	0	USD
CY2010Q4	exc	Affiliate Derivative Liabilities Current AffiliateDerivativeLiabilitiesCurrent	0	USD
CY2010Q4	exc	Affiliate Derivative Assets Noncurrent AffiliateDerivativeAssetsNoncurrent	0	USD
CY2010Q4	exc	Energy Derivative Assets Noncurrent EnergyDerivativeAssetsNoncurrent	409000000	USD
CY2010Q4	exc	Energy Derivative Liabilities Noncurrent EnergyDerivativeLiabilitiesNoncurrent	21000000	USD
CY2011Q3	us-gaap	Interest Rate Fair Value Hedge Asset At Fair Value InterestRateFairValueHedgeAssetAtFairValue	15000000	USD
	exc	Hypothetical Ten Percent Increase HypotheticalTenPercentIncrease	0.1	pure
	exc	Less Than One Million Decrease LessThanOneMillionDecrease	1000000	USD
CY2011Q3	exc	Cash Collateral Received Not Offset Against Net Derivative Position CashCollateralReceivedNotOffsetAgainstNetDerivativePosition	1000000	USD
	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	305000000	USD
	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	485000000	USD
	exc	Change In Cash Flow Hedge Ineffectiveness ChangeInCashFlowHedgeIneffectiveness	-3000000	USD
CY2011Q3	exc	Change In Cash Flow Hedge Ineffectiveness ChangeInCashFlowHedgeIneffectiveness	-12000000	USD
	exc	Change In Cash Flow Hedge Ineffectiveness ChangeInCashFlowHedgeIneffectiveness	-4000000	USD
CY2011Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2011Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.048	pure
CY2011Q3	exc	Effective Income Tax Rate Reconciliation Qualified Nuclear Decommissioning Trust Fund Income Losses EffectiveIncomeTaxRateReconciliationQualifiedNuclearDecommissioningTrustFundIncomeLosses	-0.064	pure
CY2011Q3	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.01	pure
CY2011Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.001	pure
CY2011Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.003	pure
CY2011Q3	exc	Effective Income Tax Rate Reconciliation Plant Basis Differences EffectiveIncomeTaxRateReconciliationPlantBasisDifferences	-0.032	pure
CY2011Q3	exc	Effective Income Tax Rate Reconciliation Uncertain Tax Position Remeasurement EffectiveIncomeTaxRateReconciliationUncertainTaxPositionRemeasurement	-0.011	pure
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.354	pure
CY2011Q3	exc	Effective Income Tax Rate Reconciliation Elimination Of Deductions Medicare Prescription Drug Benefit EffectiveIncomeTaxRateReconciliationEliminationOfDeductionsMedicarePrescriptionDrugBenefit	0.00	pure
	exc	Effective Income Tax Rate Reconciliation Elimination Of Deductions Medicare Prescription Drug Benefit EffectiveIncomeTaxRateReconciliationEliminationOfDeductionsMedicarePrescriptionDrugBenefit	0.00	pure
	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	-0.01	pure
CY2011Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001	pure
CY2010Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2011Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.298	pure
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.041	pure
	exc	Effective Income Tax Rate Reconciliation Qualified Nuclear Decommissioning Trust Fund Income Losses EffectiveIncomeTaxRateReconciliationQualifiedNuclearDecommissioningTrustFundIncomeLosses	-0.006	pure
	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.004	pure
	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.001	pure
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.003	pure
	exc	Effective Income Tax Rate Reconciliation Plant Basis Differences EffectiveIncomeTaxRateReconciliationPlantBasisDifferences	-0.01	pure
CY2010Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.016	pure
CY2010Q3	exc	Effective Income Tax Rate Reconciliation Qualified Nuclear Decommissioning Trust Fund Income Losses EffectiveIncomeTaxRateReconciliationQualifiedNuclearDecommissioningTrustFundIncomeLosses	0.041	pure
CY2010Q3	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.014	pure
CY2010Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.001	pure
CY2010Q3	exc	Effective Income Tax Rate Reconciliation Nontaxable Postretirement Benefits EffectiveIncomeTaxRateReconciliationNontaxablePostretirementBenefits	0.00	pure
CY2010Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.002	pure
CY2010Q3	exc	Effective Income Tax Rate Reconciliation Plant Basis Differences EffectiveIncomeTaxRateReconciliationPlantBasisDifferences	0.00	pure
CY2010Q3	exc	Effective Income Tax Rate Reconciliation Uncertain Tax Position Remeasurement EffectiveIncomeTaxRateReconciliationUncertainTaxPositionRemeasurement	0.00	pure
CY2010Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.395	pure
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.028	pure
	exc	Effective Income Tax Rate Reconciliation Qualified Nuclear Decommissioning Trust Fund Income Losses EffectiveIncomeTaxRateReconciliationQualifiedNuclearDecommissioningTrustFundIncomeLosses	0.013	pure
	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.018	pure
	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.001	pure
	exc	Effective Income Tax Rate Reconciliation Elimination Of Deductions Medicare Prescription Drug Benefit EffectiveIncomeTaxRateReconciliationEliminationOfDeductionsMedicarePrescriptionDrugBenefit	0.017	pure
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.002	pure
	exc	Effective Income Tax Rate Reconciliation Plant Basis Differences EffectiveIncomeTaxRateReconciliationPlantBasisDifferences	0.00	pure
	exc	Effective Income Tax Rate Reconciliation Uncertain Tax Position Remeasurement EffectiveIncomeTaxRateReconciliationUncertainTaxPositionRemeasurement	0.00	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.388	pure
CY2010Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.005	pure
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001	pure
CY2011Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	836000000	USD
CY2011Q3	exc	Deferred Income Tax Gain On Sale Of Assets DeferredIncomeTaxGainOnSaleOfAssets	2800000000	USD
CY2011Q3	exc	Deferred Income Tax Gain In Voluntary Conversion DeferredIncomeTaxGainInVoluntaryConversion	1600000000	USD
	exc	Deferred Income Tax Gain Like Kind Exchange DeferredIncomeTaxGainLikeKindExchange	1200000000	USD
	exc	Remeasurement Interest Expense RemeasurementInterestExpense	65000000	USD
	exc	Unrecognized Tax Benefits Income Tax Penalties Expense Involuntary Conversion UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpenseInvoluntaryConversion	110000000	USD
CY2011Q3	exc	Preliminary Tax Settlement Tax Assessed PreliminaryTaxSettlementTaxAssessed	300000000	USD
	exc	Effective Income Tax Rate Reconciliation At State Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtStateStatutoryIncomeTaxRate	0.073	pure
CY2011Q3	exc	Effective Income Tax Rate Reconciliation Impact Of Change In Enacted State Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationImpactOfChangeInEnactedStateStatutoryIncomeTaxRate	5000000	USD
	exc	Deferred State And Local Income Tax Expense Benefit State Tax Apportionment DeferredStateAndLocalIncomeTaxExpenseBenefitStateTaxApportionment	22000000	USD
	exc	State Tax Bonus Depreciation Percent StateTaxBonusDepreciationPercent	1.00	pure
	exc	State Tax Bonus Depreciation Expense Benefit StateTaxBonusDepreciationExpenseBenefit	8000000	USD
	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	7000000	USD
CY2011Q3	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	300000000	USD
	exc	Defined Benefit Plan Regulatory Asset Liability Census Update Pension Opeb DefinedBenefitPlanRegulatoryAssetLiabilityCensusUpdatePensionOpeb	31000000	USD
CY2011Q3	exc	Defined Contribution Plan Contributions By Employer DefinedContributionPlanContributionsByEmployer	26000000	USD
CY2010Q3	exc	Defined Contribution Plan Contributions By Employer DefinedContributionPlanContributionsByEmployer	20000000	USD
	exc	Defined Contribution Plan Contributions By Employer DefinedContributionPlanContributionsByEmployer	64000000	USD
CY2010Q4	exc	Nuclear Asset Retirement Obligation NuclearAssetRetirementObligation	3276000000	USD
CY2011Q3	exc	Current Payable To Zionsolutions CurrentPayableToZionsolutions	116000000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	0	USD
	exc	Nuclear Asset Retirement Obligation Liabilities Settled NuclearAssetRetirementObligationLiabilitiesSettled	3000000	USD
CY2011Q2	exc	Nuclear Decommissioning Trust Fund Special Transfer Tax Deduction Benefit NuclearDecommissioningTrustFundSpecialTransferTaxDeductionBenefit	43000000	USD
CY2011Q3	exc	Nuclear Decommissioning Trust Fund Special Transfer Tax Deduction Benefit NuclearDecommissioningTrustFundSpecialTransferTaxDeductionBenefit	3000000	USD
	exc	Electric Transmission Distribution Property Repairs Deduction Cash Benefit Detriment ElectricTransmissionDistributionPropertyRepairsDeductionCashBenefitDetriment	300000000	USD
	exc	Defined Contribution Plan Contributions By Employer DefinedContributionPlanContributionsByEmployer	61000000	USD
	exc	Nuclear Asset Retirement Obligation Accretion Expense NuclearAssetRetirementObligationAccretionExpense	155000000	USD
CY2011Q3	exc	Nuclear Asset Retirement Obligation NuclearAssetRetirementObligation	3604000000	USD
CY2011Q3	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	5000000	USD
CY2011Q3	exc	Gross Payable To Zionsolutions GrossPayableToZionsolutions	720000000	USD
	us-gaap	Site Contingency Loss Exposure Not Accrued Low Estimate SiteContingencyLossExposureNotAccruedLowEstimate	430000000	USD
	us-gaap	Depreciation Depreciation	947000000	USD
CY2011Q3	exc	Spent Nuclear Fuel Obligation Zionsolutions SpentNuclearFuelObligationZionsolutions	64000000	USD
CY2011Q3	us-gaap	Securities Loaned SecuritiesLoaned	15000000	USD
CY2011Q3	exc	Collateral For Borrowed Securities Fair Value CollateralForBorrowedSecuritiesFairValue	16000000	USD
CY2010Q4	us-gaap	Securities Loaned SecuritiesLoaned	46000000	USD
CY2010Q4	exc	Collateral For Borrowed Securities Fair Value CollateralForBorrowedSecuritiesFairValue	47000000	USD
CY2011Q3	exc	Non Qualified Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year NonQualifiedDefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear	11000000	USD
CY2011Q3	exc	Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year DefinedOtherPostretirementBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear	271000000	USD
	exc	Defined Benefit Plan Planned Target Allocation Percentage Of Assets Debt Securities DefinedBenefitPlanPlannedTargetAllocationPercentageOfAssetsDebtSecurities	0.5	pure
	exc	Defined Benefit Plan Planned Target Allocation Percentage Of Assets Equity Securities DefinedBenefitPlanPlannedTargetAllocationPercentageOfAssetsEquitySecurities	0.3	pure
	exc	Defined Benefit Plan Planned Target Allocation Percentage Of Assets Alternative Investments DefinedBenefitPlanPlannedTargetAllocationPercentageOfAssetsAlternativeInvestments	0.2	pure
CY2011Q3	exc	Percentage Of Collateral For Borrowed Securities In Domestic Currency PercentageOfCollateralForBorrowedSecuritiesInDomesticCurrency	1.02	pure
CY2011Q3	exc	Percentage Of Collateral For Borrowed Securities In Foreign Currency PercentageOfCollateralForBorrowedSecuritiesInForeignCurrency	1.05	pure
CY2011Q3	exc	Percentage Of Collateral For Borrowed Securities Required Levels PercentageOfCollateralForBorrowedSecuritiesRequiredLevels	1.00	pure
CY2011Q3	exc	Collateral Weighted Average Maturity CollateralWeightedAverageMaturity	12	Months
	exc	Plant Retirement Severance Charges PlantRetirementSeveranceCharges	3000000	USD
	exc	Plant Retirement Cash Payments PlantRetirementCashPayments	-3000000	USD
	exc	Plant Retirement Severance Obligation Other Adjustments PlantRetirementSeveranceObligationOtherAdjustments	0	USD
CY2011Q3	exc	Plant Retirement Obligations Balance PlantRetirementObligationsBalance	7000000	USD
CY2010Q4	exc	Plant Retirement Obligations Balance PlantRetirementObligationsBalance	7000000	USD
CY2009Q4	exc	Plant Retirements Positions Eliminated PlantRetirementsPositionsEliminated	253	EmployeePositions
CY2011Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
CY2010Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	9000000	shares
CY2010Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	9000000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	6000000	shares
CY2011Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	10000000	shares
	us-gaap	Line Of Credit Facility Increase Decrease For Period Net LineOfCreditFacilityIncreaseDecreaseForPeriodNet	-77000000	USD
	exc	Increase Decrease In Guarantee Obligations IncreaseDecreaseInGuaranteeObligations	-53000000	USD
CY2011Q3	us-gaap	Capital Leases Net Investment In Direct Financing Leases CapitalLeasesNetInvestmentInDirectFinancingLeases	649000000	USD
	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	40000000	USD
	exc	Nuclear Fuel Amortization NuclearFuelAmortization	556000000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	159000000	USD
	us-gaap	Depreciation Depreciation	845000000	USD
	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	766000000	USD
	exc	Nuclear Fuel Amortization NuclearFuelAmortization	496000000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	148000000	USD
CY2011Q3	us-gaap	Depreciation Depreciation	319000000	USD
CY2011Q3	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	13000000	USD
CY2011Q3	exc	Nuclear Fuel Amortization NuclearFuelAmortization	200000000	USD
CY2011Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	56000000	USD
CY2010Q3	exc	Nuclear Fuel Amortization NuclearFuelAmortization	173000000	USD
CY2010Q3	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	290000000	USD
CY2010Q3	us-gaap	Depreciation Depreciation	288000000	USD
CY2010Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	49000000	USD
CY2011Q3	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	588000000	USD
CY2010Q3	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	800000000	USD
CY2011Q3	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	16000000	USD
CY2011Q3	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	13000000	USD
CY2011Q3	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsRegulatoryAccounting	-363000000	USD
CY2011Q3	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsNonregulatoryAccounting	-141000000	USD
CY2011Q3	exc	Regulatory Offset Nuclear Decommissioning Trust Fund Activity RegulatoryOffsetNuclearDecommissioningTrustFundActivity	-281000000	USD
CY2011Q3	exc	Gain Loss Investment Income Nuclear Decommissioning Trust Funds GainLossInvestmentIncomeNuclearDecommissioningTrustFunds	-198000000	USD
CY2011Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	1000000	USD
CY2011Q3	us-gaap	Capital Leases Income Statement Direct Financing Lease Revenue CapitalLeasesIncomeStatementDirectFinancingLeaseRevenue	7000000	USD
CY2011Q3	exc	Unrecognized Tax Benefits Interest Income UnrecognizedTaxBenefitsInterestIncome	7000000	USD
CY2011Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	0	USD
CY2011Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	4000000	USD
CY2011Q3	exc	Net Unrealized Gain Loss On Pledged Assets NetUnrealizedGainLossOnPledgedAssets	-4000000	USD
	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	97000000	USD
	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	39000000	USD
	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsRegulatoryAccounting	-223000000	USD
	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsNonregulatoryAccounting	-88000000	USD
	exc	Regulatory Offset Nuclear Decommissioning Trust Fund Activity RegulatoryOffsetNuclearDecommissioningTrustFundActivity	-60000000	USD
	exc	Gain Loss Investment Income Nuclear Decommissioning Trust Funds GainLossInvestmentIncomeNuclearDecommissioningTrustFunds	-74000000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	3000000	USD
	us-gaap	Capital Leases Income Statement Direct Financing Lease Revenue CapitalLeasesIncomeStatementDirectFinancingLeaseRevenue	21000000	USD
	exc	Unrecognized Tax Benefits Interest Income UnrecognizedTaxBenefitsInterestIncome	53000000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-2000000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	14000000	USD
	exc	Net Unrealized Gain Loss On Pledged Assets NetUnrealizedGainLossOnPledgedAssets	41000000	USD
CY2010Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	2000000	USD
	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	140000000	USD
	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	38000000	USD
	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsRegulatoryAccounting	117000000	USD
	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsNonregulatoryAccounting	48000000	USD
	exc	Regulatory Offset Nuclear Decommissioning Trust Fund Activity RegulatoryOffsetNuclearDecommissioningTrustFundActivity	206000000	USD
	exc	Gain Loss Investment Income Nuclear Decommissioning Trust Funds GainLossInvestmentIncomeNuclearDecommissioningTrustFunds	137000000	USD
	us-gaap	Capital Leases Income Statement Direct Financing Lease Revenue CapitalLeasesIncomeStatementDirectFinancingLeaseRevenue	20000000	USD
	exc	Unrecognized Tax Benefits Interest Income UnrecognizedTaxBenefitsInterestIncome	0	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	15000000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	6000000	USD
	exc	Under Over Recovered Uncollectible Accounts UnderOverRecoveredUncollectibleAccounts	-14000000	USD
	exc	Increase Decrease In Other Current Operating Assets IncreaseDecreaseInOtherCurrentOperatingAssets	163000000	USD
	exc	Impacts Two Thousand Ten Rate Case ImpactsTwoThousandTenRateCase	-32000000	USD
CY2011Q3	exc	Bargain Purchase Gain Wolf Hollow Acquisition BargainPurchaseGainWolfHollowAcquisition	-36000000	USD
	exc	Under Over Recovered Uncollectible Accounts UnderOverRecoveredUncollectibleAccounts	36000000	USD
	exc	Increase Decrease In Other Current Operating Assets IncreaseDecreaseInOtherCurrentOperatingAssets	81000000	USD
	exc	Taxes Other Than Income Refund Accrual TaxesOtherThanIncomeRefundAccrual	-25000000	USD
	exc	Inventory Adjustments During Period InventoryAdjustmentsDuringPeriod	57000000	USD
CY2011Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	10919000000	USD
CY2011Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	244000000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	10064000000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	228000000	USD
CY2011Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	145000000	USD
CY2011Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	2685000000	USD
CY2011Q3	exc	Accumulated Unrealized Gain Loss Marketable Securities AccumulatedUnrealizedGainLossMarketableSecurities	0	USD
CY2010Q4	exc	Accumulated Unrealized Gain Loss Marketable Securities AccumulatedUnrealizedGainLossMarketableSecurities	0	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	400000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	2823000000	USD
	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	9000000	USD
	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	14933000000	USD
	us-gaap	Profit Loss ProfitLoss	1889000000	USD
	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	14150000000	USD
	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	6000000	USD
	us-gaap	Profit Loss ProfitLoss	2039000000	USD
CY2011Q3	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	5295000000	USD
CY2010Q3	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	3000000	USD
CY2011Q3	exc	Minimum Additional Ghg Emissions Required For Eligibility For Stationary Source Permitting After Modifications MinimumAdditionalGhgEmissionsRequiredForEligibilityForStationarySourcePermittingAfterModifications	75000	Tons
CY2010Q3	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting	41000000	USD
CY2010Q3	exc	Regulatory Offset Nuclear Decommissioning Trust Fund Activity RegulatoryOffsetNuclearDecommissioningTrustFundActivity	292000000	USD
	exc	Other Noncash Income Expense Net OtherNoncashIncomeExpenseNet	18000000	USD
	us-gaap	Increase Decrease In Over Under Energy Recovery IncreaseDecreaseInOverUnderEnergyRecovery	9000000	USD
	exc	Increase Decrease In Other Noncurrent Operating Assets Liabilities IncreaseDecreaseInOtherNoncurrentOperatingAssetsLiabilities	-83000000	USD
CY2010Q3	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	5291000000	USD
CY2010Q3	exc	Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting	12000000	USD
CY2010Q3	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsRegulatoryAccounting	324000000	USD
CY2010Q3	exc	Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting UnrealizedGainLossNuclearDecommissioningTrustFundsNonregulatoryAccounting	107000000	USD
	exc	Amortization Of Regulatory Asset Debt Costs AmortizationOfRegulatoryAssetDebtCosts	16000000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	92000000	USD
CY2011Q3	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	7000000	USD
CY2010Q3	us-gaap	Profit Loss ProfitLoss	845000000	USD
	dei	Entity Registrant Name EntityRegistrantName	EXELON CORP
	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2011Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	663012607	shares
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2255000000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	240000000	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	281000000	USD
CY2011Q3	exc	Fair Value Liabilities Measured On Recurring Basis Total FairValueLiabilitiesMeasuredOnRecurringBasisTotal	187000000	USD
CY2011Q3	exc	Fair Value Asset And Liabilities Measured On Recurring Basis Total Net FairValueAssetAndLiabilitiesMeasuredOnRecurringBasisTotalNet	9180000000	USD
CY2010Q4	exc	Fair Value Asset And Liabilities Measured On Recurring Basis Total Net FairValueAssetAndLiabilitiesMeasuredOnRecurringBasisTotalNet	9466000000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	310000000	USD
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	2756000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1398000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	827000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1042000000	USD
	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	34000000	USD
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	3120000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	3000000	USD
	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	26000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-67000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	573000000	USD
	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	2089000000	USD
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	380000000	USD
	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	0	USD
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2010Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	590000000	USD
CY2011Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	31882000000	USD
CY2011Q3	us-gaap	Long Term Investments LongTermInvestments	740000000	USD
CY2011Q3	us-gaap	Goodwill Goodwill	2625000000	USD
CY2011Q3	us-gaap	Pledged Assets Not Separately Reported Finance Receivables PledgedAssetsNotSeparatelyReportedFinanceReceivables	351000000	USD
CY2010Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	4140000000	USD
CY2011Q3	us-gaap	Assets Held In Trust Noncurrent AssetsHeldInTrustNoncurrent	763000000	USD
CY2010Q4	us-gaap	Assets Held In Trust Noncurrent AssetsHeldInTrustNoncurrent	824000000	USD
CY2010Q4	us-gaap	Pledged Assets Not Separately Reported Finance Receivables PledgedAssetsNotSeparatelyReportedFinanceReceivables	346000000	USD
CY2011Q3	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	183000000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	9304000000	USD
CY2011Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	1475000000	USD
CY2011Q3	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	2371000000	USD
CY2011Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	79000000	USD
CY2011Q3	us-gaap	Liabilities Liabilities	39710000000	USD
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2010Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	3555000000	USD
CY2011Q3	us-gaap	Minority Interest MinorityInterest	3000000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1047000000	USD
CY2011Q3	exc	Cash Flow Hedge Ineffectiveness Adjustment To Accumulated Other Comprehensive Income CashFlowHedgeIneffectivenessAdjustmentToAccumulatedOtherComprehensiveIncome	3000000	USD
CY2010Q3	exc	Change In Cash Flow Hedge Ineffectiveness ChangeInCashFlowHedgeIneffectiveness	3000000	USD
CY2011Q3	us-gaap	Pledged Assets Separately Reported On Statement Of Financial Position At Fair Value PledgedAssetsSeparatelyReportedOnStatementOfFinancialPositionAtFairValue	225000000	USD
CY2010	exc	Preliminary Settlement Payment To Irs PreliminarySettlementPaymentToIrs	302000000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	-39000000	USD
CY2010Q3	us-gaap	Capital Leases Income Statement Direct Financing Lease Revenue CapitalLeasesIncomeStatementDirectFinancingLeaseRevenue	7000000	USD
CY2010Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	5000000	USD
	exc	Energy Related Options EnergyRelatedOptions	-54000000	USD

Files In Submission

Name	View Source	Status
0001193125-11-281748-index-headers.html	Edgar Link	pending
0001193125-11-281748-index.html	Edgar Link	pending
0001193125-11-281748.txt	Edgar Link	pending
0001193125-11-281748-xbrl.zip	Edgar Link	pending
d246704d10q.htm	Edgar Link	pending
d246704dex311.htm	Edgar Link	pending
d246704dex312.htm	Edgar Link	pending
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d246704dex326.htm	Edgar Link	pending
d246704dex327.htm	Edgar Link	pending
d246704dex328.htm	Edgar Link	pending
exc-20110930.xml	Edgar Link	completed
exc-20110930.xsd	Edgar Link	pending
exc-20110930_cal.xml	Edgar Link	unprocessable
exc-20110930_def.xml	Edgar Link	unprocessable
exc-20110930_lab.xml	Edgar Link	unprocessable
exc-20110930_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$EXC
EXELON CORP Stock $exc

2011 Q3 Form 10-Q Financial Statement

#000119312511281748 Filed on October 26, 2011

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EXC EXELON CORP Stock $exc

2011 Q3 Form 10-Q Financial Statement

#000119312511281748 Filed on October 26, 2011

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EXC
EXELON CORP Stock $exc