$FE
FirstEnergy Corp Stock $fe

$fe Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000103129613000010 Filed on February 25, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$3.860B	$4.719B	$4.060B
YoY Change	21.73%	26.58%	29.34%
Cost Of Revenue	$1.120B	$1.349B	$1.220B
YoY Change	11.55%	2.27%	14.77%
Gross Profit	$2.672B	$3.370B	$2.840B
YoY Change	23.3%	39.89%	36.67%
Gross Profit Margin	69.22%	71.41%	69.95%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$283.0M	$284.0M	$279.0M
YoY Change	52.97%	56.04%	46.84%
% of Gross Profit	10.59%	8.43%	9.82%
Operating Expenses	$1.982B	$2.313B	$2.319B
YoY Change	32.4%	35.9%	49.42%
Operating Profit	-$230.0M	$1.057B	$521.0M
YoY Change	-134.33%	154.7%	-0.95%
Interest Expense	-$216.0M	-$202.0M	-$214.0M
YoY Change	44.0%	66.94%	57.35%
% of Operating Profit		-19.11%	-41.07%
Other Income/Expense, Net		-$202.0M	-$214.0M
YoY Change		66.94%	57.35%
Pretax Income	$123.0M	$855.0M	$307.0M
YoY Change	-47.88%	190.82%	-21.28%
Income Tax	$24.00M	$325.0M	$114.0M
% Of Pretax Income	19.51%	38.01%	37.13%
Net Earnings	$98.00M	$532.0M	$203.0M
YoY Change	-31.47%	197.21%	-23.4%
Net Earnings / Revenue	2.54%	11.27%	5.0%
Basic Earnings Per Share	$0.23	$1.27	$0.48
Diluted Earnings Per Share	$0.23	$1.27	$0.48
COMMON SHARES
Basic Shares Outstanding	418.2M shares	418.0M shares	418.0M shares
Diluted Shares Outstanding		420.0M shares	420.0M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$202.0M	$213.0M	$398.0M
YoY Change	-80.18%	-66.3%	41.64%
Cash & Equivalents	$202.0M	$291.0M	$476.0M
Short-Term Investments
Other Short-Term Assets	$122.0M	$189.0M	$1.020B
YoY Change	32.61%	-25.0%	395.15%
Inventory	$811.0M	$822.0M	$866.0M
Prepaid Expenses
Receivables	$1.525B	$1.633B	$1.578B
Other Receivables	$269.0M	$247.0M	$256.0M
Total Short-Term Assets	$3.355B	$3.591B	$4.118B
YoY Change	-9.28%	5.9%	32.24%
LONG-TERM ASSETS
Property, Plant & Equipment	$30.34B	$29.27B	$29.44B
YoY Change	47.91%	49.8%	50.59%
Goodwill	$6.441B	$6.428B	$6.436B
YoY Change	15.53%	15.3%	15.44%
Intangibles		$910.0M
YoY Change
Long-Term Investments	$1.410B	$1.072B	$1.105B
YoY Change	37.03%	2.1%	2.79%
Other Assets	$1.641B	$751.0M	$5.504B
YoY Change	79.15%	-9.08%	567.15%
Total Long-Term Assets	$10.11B	$10.27B	$43.48B
YoY Change	21.52%	17.19%	391.44%
TOTAL ASSETS
Total Short-Term Assets	$3.355B	$3.591B	$4.118B
Total Long-Term Assets	$10.11B	$10.27B	$43.48B
Total Assets	$47.41B	$48.67B	$47.60B
YoY Change	33.43%	40.24%	38.1%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.174B	$1.009B	$1.122B
YoY Change	34.63%	24.11%	32.31%
Accrued Expenses	$384.0M	$350.0M	$331.0M
YoY Change	21.9%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$656.0M
YoY Change	-100.0%	-100.0%	-55.16%
Long-Term Debt Due	$1.621B	$1.840B	$2.058B
YoY Change	-209.08%	15.72%	31.0%
Total Short-Term Liabilities	$4.855B	$4.863B	$5.544B
YoY Change	3.21%	-2.19%	9.89%
LONG-TERM LIABILITIES
Long-Term Debt	$15.72B	$15.82B	$16.49B
YoY Change	24.94%	30.73%	39.04%
Other Long-Term Liabilities	$2.072B	$2.127B	$7.392B
YoY Change	44.29%	73.07%	504.91%
Total Long-Term Liabilities	$13.46B	$12.56B	$23.88B
YoY Change	44.75%	40.48%	173.23%
TOTAL LIABILITIES
Total Short-Term Liabilities	$4.855B	$4.863B	$5.544B
Total Long-Term Liabilities	$13.46B	$12.56B	$23.88B
Total Liabilities	$18.31B	$17.42B	$34.60B
YoY Change	30.79%	25.23%	150.96%
SHAREHOLDERS EQUITY
Retained Earnings	$3.047B	$4.658B
YoY Change	-1.2%	1.46%
Common Stock	$9.765B	$9.782B
YoY Change	79.37%	79.65%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$13.28B	$13.05B	$13.00B
YoY Change
Total Liabilities & Shareholders Equity	$47.33B	$46.66B	$47.60B
YoY Change	33.2%	34.44%	38.1%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$98.00M	$532.0M	$203.0M
YoY Change	-31.47%	197.21%	-23.4%
Depreciation, Depletion And Amortization	$283.0M	$284.0M	$279.0M
YoY Change	52.97%	56.04%	46.84%
Cash From Operating Activities	$834.0M	$1.198B	$540.0M
YoY Change	-16.85%	-1.4%	53.41%
INVESTING ACTIVITIES
Capital Expenditures	-$749.0M	-$511.0M	-$569.0M
YoY Change	50.1%	7.58%	15.42%
Acquisitions
YoY Change
Other Investing Activities	$348.0M	$491.0M	-$107.0M
YoY Change	-8800.0%	-16466.67%	-5450.0%
Cash From Investing Activities	-$401.0M	-$20.00M	-$676.0M
YoY Change	-20.28%	-95.82%	37.68%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-522.0M	-1.363B	-489.0M
YoY Change	361.95%	253.11%	-544.55%
NET CHANGE
Cash From Operating Activities	834.0M	1.198B	540.0M
Cash From Investing Activities	-401.0M	-20.00M	-676.0M
Cash From Financing Activities	-522.0M	-1.363B	-489.0M
Net Change In Cash	-89.00M	-185.0M	-625.0M
YoY Change	-123.0%	-152.71%	2055.17%
FREE CASH FLOW
Cash From Operating Activities	$834.0M	$1.198B	$540.0M
Capital Expenditures	-$749.0M	-$511.0M	-$569.0M
Free Cash Flow	$1.583B	$1.709B	$1.109B
YoY Change	5.39%	1.12%	31.24%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1174000000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1525000000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1614000000	USD
CY2012Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	331000000	USD
CY2011Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	384000000	USD
CY2011Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	558000000	USD
CY2012Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	543000000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	12600000000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	11839000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-39000000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-38000000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-408000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-446000000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	385000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	426000000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	9765000000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	9769000000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	127000000	USD
CY2011	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	474000000	USD
CY2012	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	307000000	USD
CY2010	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	736000000	USD
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	413000000	USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	388000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1497000000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1407000000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1599000000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	97000000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	104000000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation Legally Restricted Assets Fair Value AssetRetirementObligationLegallyRestrictedAssetsFairValue	2204000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation Legally Restricted Assets Fair Value AssetRetirementObligationLegallyRestrictedAssetsFairValue	2112000000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	60000000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	15000000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	2000000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	52000000	USD
CY2012Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	1599000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	1497000000	USD
CY2012Q4	us-gaap	Assets Assets	50406000000	USD
CY2011Q4	us-gaap	Assets Assets	47326000000	USD
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CY2011Q4	us-gaap	Assets Current AssetsCurrent	3355000000	USD
CY2012Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	10541000000	USD
CY2011Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	10112000000	USD
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CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	179000000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	229000000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	3172000000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	4207000000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	2980000000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	99000000	USD
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CY2011	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	90000000	USD
CY2011Q1	us-gaap	Business Acquisition Cost Of Acquired Entity Liabilities Incurred BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurred	27000000	USD
CY2011Q1	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	4327000000	USD
CY2011	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	2.34
CY2010	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	2.83
CY2011Q1	us-gaap	Business Acquisition Purchase Price Allocation Current Liabilities BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities	718000000	USD
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CY2011	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	979000000	USD
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CY2010	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	18569000000	USD
CY2011	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	17449000000	USD
CY2011Q1	us-gaap	Business Combination Consideration Transferred BusinessCombinationConsiderationTransferred	4354000000	USD
CY2011Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	108000000	USD
CY2012Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	176000000	USD
CY2012Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	32000000	USD
CY2012Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	144000000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	211000000	USD
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CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	24000000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	29000000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	32000000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	35000000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	55000000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	35000000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	176000000	USD
CY2011	us-gaap	Capital Leases Income Statement Interest Expense CapitalLeasesIncomeStatementInterestExpense	6000000	USD
CY2010	us-gaap	Capital Leases Income Statement Interest Expense CapitalLeasesIncomeStatementInterestExpense	2000000	USD
CY2012	us-gaap	Capital Leases Income Statement Interest Expense CapitalLeasesIncomeStatementInterestExpense	5000000	USD
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CY2012Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	28272000000	USD
CY2011	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	590000000	USD
CY2012	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2010	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	172000000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	202000000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1019000000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	874000000	USD
CY2012	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	8000000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2012Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.55
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CY2012Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.55
CY2011Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.55
CY2012Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.55
CY2011Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.55
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.2
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.2
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.1
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.1
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	490000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	490000000	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	418216437	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	418216437	shares
CY2012Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	42000000	USD
CY2011Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	42000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	886000000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	729000000	USD
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CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	730000000	USD
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CY2011Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	2054000000	USD
CY2012Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	2293000000	USD
CY2010	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	4624000000	USD
CY2011	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	4875000000	USD
CY2012	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	4237000000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	11596000000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	13127000000	USD
CY2011	us-gaap	Costs And Expenses CostsAndExpenses	14449000000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-23000000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-122000000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-243000000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-224000000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-94000000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	28000000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	35000000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	19000000	USD
CY2012	us-gaap	Debt Instrument Sinking Fund Payment DebtInstrumentSinkingFundPayment	7000000	USD
CY2011Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-64000000	USD
CY2012Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-45000000	USD
CY2011Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	2112000000	USD
CY2012Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	2204000000	USD
CY2012Q4	us-gaap	Deferred Compensation Arrangement With Individual Shares Authorized For Issuance DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance	1700000	shares
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	580000000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	432000000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	785000000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	809000000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	459000000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	658000000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	798000000	USD
CY2012	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	647000000	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	450000000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	24000000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	78000000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	27000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	785000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-6297000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-5670000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	319000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	0	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	5670000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	6616000000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	-30000000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	-3000000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	34000000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	3000000	USD
CY2010	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	190000000	USD
CY2012	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	609000000	USD
CY2011	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	507000000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	609000000	USD
CY2012Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	0	USD
CY2011Q1	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	0	USD
CY2011Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	0	USD
CY2011Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	507000000	USD
CY2011Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	0	USD
CY2012Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	0	USD
CY2012Q1	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease	0	USD
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2012	us-gaap	Defined Benefit Plan Target Plan Asset Allocations DefinedBenefitPlanTargetPlanAssetAllocations	1.00
CY2011	us-gaap	Defined Benefit Plan Target Plan Asset Allocations DefinedBenefitPlanTargetPlanAssetAllocations	1.00
CY2011	us-gaap	Depreciation Depreciation	1066000000	USD
CY2010	us-gaap	Depreciation Depreciation	750000000	USD
CY2012	us-gaap	Depreciation Depreciation	1124000000	USD
CY2011Q1	us-gaap	Depreciation Depreciation	220000000	USD
CY2011Q3	us-gaap	Depreciation Depreciation	284000000	USD
CY2011Q2	us-gaap	Depreciation Depreciation	279000000	USD
CY2012Q4	us-gaap	Depreciation Depreciation	287000000	USD
CY2011Q4	us-gaap	Depreciation Depreciation	283000000	USD
CY2012Q1	us-gaap	Depreciation Depreciation	279000000	USD
CY2012Q2	us-gaap	Depreciation Depreciation	285000000	USD
CY2012Q3	us-gaap	Depreciation Depreciation	273000000	USD
CY2010	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1472000000	USD
CY2011	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1395000000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1056000000	USD
CY2012Q4	us-gaap	Derivative Asset Fair Value Net DerivativeAssetFairValueNet	98000000	USD
CY2011Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	235000000	USD
CY2012Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	192000000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	321000000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	296000000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	597000000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	619000000	USD
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	218000000	USD
CY2012Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	126000000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.22
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.44
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.85
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.27
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.35
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.42
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.84
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.21
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.35
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	309000000	USD
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.15
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2011	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	10400000000	USD
CY2010	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	9820000000	USD
CY2012	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	9637000000	USD
CY2012Q3	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	4059000000	USD
CY2011Q4	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	3860000000	USD
CY2012Q2	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	3754000000	USD
CY2012Q4	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	3500000000	USD
CY2011Q1	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	3576000000	USD
CY2011Q3	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	4674000000	USD
CY2012Q1	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	3990000000	USD
CY2011Q2	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	4037000000	USD
CY2011	us-gaap	Electric Worldwide Unregulated Revenue ElectricWorldwideUnregulatedRevenue	5747000000	USD
CY2012	us-gaap	Electric Worldwide Unregulated Revenue ElectricWorldwideUnregulatedRevenue	5666000000	USD
CY2010	us-gaap	Electric Worldwide Unregulated Revenue ElectricWorldwideUnregulatedRevenue	3519000000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	22000000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	11000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	14000000	USD
CY2011	us-gaap	Excise Taxes Collected ExciseTaxesCollected	486000000	USD
CY2010	us-gaap	Excise Taxes Collected ExciseTaxesCollected	428000000	USD
CY2012	us-gaap	Excise Taxes Collected ExciseTaxesCollected	455000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	314000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	237000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	96000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	68000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	75000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	75000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	83000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1016000000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	702000000	USD
CY2010	us-gaap	Fuel Costs FuelCosts	1432000000	USD
CY2011	us-gaap	Fuel Costs FuelCosts	2317000000	USD
CY2012	us-gaap	Fuel Costs FuelCosts	2471000000	USD
CY2012	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	71000000	USD
CY2011	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	59000000	USD
CY2010	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	55000000	USD
CY2012	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	17000000	USD
CY2011	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	545000000	USD
CY2010	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	2000000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	6447000000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	6441000000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	5575000000	USD
CY2012	us-gaap	Goodwill Other Changes GoodwillOtherChanges	0	USD
CY2012	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	6000000	USD
CY2012Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	4000000000	USD
CY2012Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	773000000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Noncurrent HeldToMaturitySecuritiesNoncurrent	54000000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Noncurrent HeldToMaturitySecuritiesNoncurrent	402000000	USD
CY2011	us-gaap	Impairment Of Investments ImpairmentOfInvestments	19000000	USD
CY2010	us-gaap	Impairment Of Investments ImpairmentOfInvestments	33000000	USD
CY2012	us-gaap	Impairment Of Investments ImpairmentOfInvestments	16000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1180000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1324000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1443000000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	734000000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	315000000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	528000000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	123000000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	855000000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	158000000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-253000000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	307000000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	574000000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	462000000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	553000000	USD
CY2011Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	114000000	USD
CY2011Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	325000000	USD
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	222000000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-20000000	USD
CY2012Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	127000000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	10000000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	27000000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	69000000	USD
CY2012Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-105000000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	28000000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	40000000	USD
CY2011Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111000000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	9000000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	9000000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	11000000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	11000000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-34000000	USD
CY2011Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24000000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-19000000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	60000000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-36000000	USD
CY2012	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-32000000	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-17000000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	-16000000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	511000000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	463000000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	421000000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-9000000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-11000000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-6000000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-42000000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-358000000	USD
CY2010	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	177000000	USD
CY2012	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	13000000	USD
CY2011	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-147000000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	43000000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	71000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	35000000	USD
CY2010	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	57000000	USD
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	91000000	USD
CY2012	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	6000000	USD
CY2010	us-gaap	Increase Decrease In Deposits Outstanding IncreaseDecreaseInDepositsOutstanding	26000000	USD
CY2011	us-gaap	Increase Decrease In Deposits Outstanding IncreaseDecreaseInDepositsOutstanding	79000000	USD
CY2012	us-gaap	Increase Decrease In Deposits Outstanding IncreaseDecreaseInDepositsOutstanding	-16000000	USD
CY2011	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	69000000	USD
CY2010	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	21000000	USD
CY2012	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-55000000	USD
CY2011	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-12000000	USD
CY2012	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-12000000	USD
CY2010	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	7000000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	50000000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-2000000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-14000000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-98000000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-15000000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	79000000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	12000000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-100000000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-101000000	USD
CY2012	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-345000000	USD
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2011	us-gaap	Interest And Debt Expense InterestAndDebtExpense	1008000000	USD
CY2010	us-gaap	Interest And Debt Expense InterestAndDebtExpense	845000000	USD
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000	shares
CY2011Q4	us-gaap	Minority Interest MinorityInterest	19000000	USD
CY2012	us-gaap	Interest And Debt Expense InterestAndDebtExpense	1001000000	USD
CY2011	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	-70000000	USD
CY2010	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	-165000000	USD
CY2012	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	-72000000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	662000000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	962000000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	935000000	USD
CY2010	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	-845000000	USD
CY2012	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	-1001000000	USD
CY2011	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	-1008000000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	811000000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	861000000	USD
CY2010	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	117000000	USD
CY2011	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	114000000	USD
CY2012	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	77000000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	307000000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	228000000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	226000000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	50406000000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	47326000000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	4855000000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	7605000000	USD
CY2012Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	14529000000	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	13456000000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	5550000000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	15716000000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	15179000000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	1621000000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	1999000000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1621000000	USD
CY2012Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1999000000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1970000000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1736000000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1267000000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1639000000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1026000000	USD
CY2012Q4	us-gaap	Long Term Investments LongTermInvestments	3194000000	USD
CY2011Q4	us-gaap	Long Term Investments LongTermInvestments	3522000000	USD
CY2012Q4	us-gaap	Longterm Pollution Control Bond Current LongtermPollutionControlBondCurrent	809000000	USD
CY2012Q4	us-gaap	Longterm Pollution Control Bond Current And Noncurrent LongtermPollutionControlBondCurrentAndNoncurrent	493000000	USD
CY2011Q4	us-gaap	Longterm Pollution Control Bond Current And Noncurrent LongtermPollutionControlBondCurrentAndNoncurrent	513000000	USD
CY2011Q4	us-gaap	Longterm Transition Bond Current And Noncurrent LongtermTransitionBondCurrentAndNoncurrent	287000000	USD
CY2012Q4	us-gaap	Longterm Transition Bond Current And Noncurrent LongtermTransitionBondCurrentAndNoncurrent	243000000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	11000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-817000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-30000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	145000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-2924000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	807000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-983000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1948000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-3157000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-956000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	3076000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	2320000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	3063000000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	770000000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	885000000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	742000000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	306000000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	425000000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	52000000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	203000000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	-148000000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	532000000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	98000000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	187000000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-16000000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1000000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-24000000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-563000000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-852000000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-255000000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	1743000000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	2176000000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	1698000000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-230000000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	746000000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	521000000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	907000000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	1057000000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	557000000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	350000000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-34000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	2620000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	210000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	123000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	201000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	206000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	202000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	1678000000	USD
CY2012Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	15800000000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	122000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-59000000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	176000000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1719000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-72000000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1641000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-6000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	19000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	8000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-120000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-48000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-176000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	1000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	23000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	36000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-102000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-41000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	220000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	90000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	115000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-64000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-91000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-76000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-54000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	35000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	38000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-79000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-49000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-74000000	USD
CY2012	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	-191000000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	-169000000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	-87000000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1000000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	8000000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	14000000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3000000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	7000000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-2000000	USD
CY2011	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3964000000	USD
CY2010	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2714000000	USD
CY2012	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3769000000	USD
CY2012Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	865000000	USD
CY2011Q4	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	928000000	USD
CY2012Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	818000000	USD
CY2012Q4	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1165000000	USD
CY2012Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	921000000	USD
CY2011Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	997000000	USD
CY2011Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1066000000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1038000000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-27000000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-51000000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	41000000	USD
CY2012	us-gaap	Payments For Removal Costs PaymentsForRemovalCosts	229000000	USD
CY2011	us-gaap	Payments For Removal Costs PaymentsForRemovalCosts	114000000	USD
CY2010	us-gaap	Payments For Removal Costs PaymentsForRemovalCosts	35000000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	670000000	USD
CY2011Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	973000000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	900000000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	920000000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	881000000	USD
CY2012	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-102000000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2072000000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1836000000	USD
CY2012Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	936000000	USD
CY2011Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	1008000000	USD
CY2012Q4	us-gaap	Other Receivables OtherReceivables	315000000	USD
CY2011Q4	us-gaap	Other Receivables OtherReceivables	269000000	USD
CY2010	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	183000000	USD
CY2012	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	286000000	USD
CY2011	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	149000000	USD
CY2011	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-60000000	USD
CY2010	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-66000000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	3219000000	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	3020000000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	4309000000	USD
CY2012	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	2000000	USD
CY2010	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	113000000	USD
CY2011	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	3000000	USD
CY2010	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1780000000	USD
CY2011	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2129000000	USD
CY2012	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2678000000	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-151000000	USD
CY2012	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-127000000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-86000000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	2823000000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	3080000000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	47000000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	40122000000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	43210000000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	32903000000	USD
CY2010	us-gaap	Pension Contributions PensionContributions	0	USD
CY2011	us-gaap	Pension Contributions PensionContributions	372000000	USD
CY2012	us-gaap	Pension Contributions PensionContributions	600000000	USD
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	100
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2011Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2011Q4	us-gaap	Prepaid Taxes PrepaidTaxes	191000000	USD
CY2012Q4	us-gaap	Prepaid Taxes PrepaidTaxes	119000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1099000000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	750000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	604000000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-38000000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-19000000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-52000000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	4207000000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	2980000000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	3172000000	USD
CY2011	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	840000000	USD
CY2012	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	17000000	USD
CY2010	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	117000000	USD
CY2012	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	1969000000	USD
CY2011	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2010	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2010	us-gaap	Profit Loss ProfitLoss	718000000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	869000000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	771000000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	-148000000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	425000000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	188000000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	530000000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	99000000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	193000000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	306000000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	30337000000	USD
CY2012Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2375000000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2030000000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	381000000	USD
CY2012Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	392000000	USD
CY2012Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	779000000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1909000000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	940000000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1015000000	USD
CY2010	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	378000000	USD
CY2011	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	700000000	USD
CY2012	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	0	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2888000000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3047000000	USD
CY2012	us-gaap	Revenues From External Customers RevenuesFromExternalCustomers	15301000000	USD
CY2011	us-gaap	Revenues From External Customers RevenuesFromExternalCustomers	16080000000	USD
CY2010	us-gaap	Revenues From External Customers RevenuesFromExternalCustomers	13265000000	USD
CY2010	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	74000000	USD
CY2012	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	2000000	USD
CY2011	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	67000000	USD
CY2011Q4	us-gaap	Sale Leaseback Transaction Deferred Gain Net SaleLeasebackTransactionDeferredGainNet	925000000	USD
CY2012Q4	us-gaap	Sale Leaseback Transaction Deferred Gain Net SaleLeasebackTransactionDeferredGainNet	892000000	USD
CY2010	us-gaap	Sales Revenue Net SalesRevenueNet	13339000000	USD
CY2012	us-gaap	Sales Revenue Net SalesRevenueNet	15303000000	USD
CY2011	us-gaap	Sales Revenue Net SalesRevenueNet	16147000000	USD
CY2012Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	40.33
CY2012	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P3Y10M2D
CY2012Q4	us-gaap	Secured Debt SecuredDebt	2163000000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	2775000000	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	29000000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5000000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2348469	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	3593863	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	18000000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	18708	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4255985	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2910269	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	38.17
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	40.33
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	33.11
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	59.58
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	2910269	shares
CY2011Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	0	USD
CY2012Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	1969000000	USD
CY2012Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0197
CY2011Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0000
CY2011	us-gaap	Stock Issued1 StockIssued1	4354000000	USD
CY2012	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2010	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1327008	shares
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	13280000000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	13084000000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	13299000000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	13093000000	USD
CY2010	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	21000000	USD
CY2010	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	776000000	USD
CY2011	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	978000000	USD
CY2012	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	985000000	USD
CY2012	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	95000000	USD
CY2011	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	27000000	USD
CY2010	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	81000000	USD
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-129000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	117000000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	191000000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	43000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	45000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	7000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	78000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	35000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	37000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	81000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	77000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	38000000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	34000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	97000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	10000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2000000	USD
CY2012Q1	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	0	USD
CY2012Q4	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	10000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	6000000	USD
CY2012Q4	us-gaap	Unsecured Debt UnsecuredDebt	12104000000	USD
CY2011Q4	us-gaap	Unsecured Debt UnsecuredDebt	11743000000	USD
CY2011	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	413000000	USD
CY2010	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	388000000	USD
CY2012	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	0	USD
CY2012Q2	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	0	USD
CY2012Q3	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	0	USD
CY2011Q2	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	7000000	USD
CY2011Q4	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	372000000	USD
CY2011Q3	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	9000000	USD
CY2011Q1	us-gaap	Utilities Operating Expense Impairments UtilitiesOperatingExpenseImpairments	25000000	USD
CY2011	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	978000000	USD
CY2010	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	776000000	USD
CY2012	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	985000000	USD
CY2011	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-27000000	USD
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	419000000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	305000000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	401000000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	304000000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	418000000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	399000000	shares
CY2012Q4	fe	Accumulated Other Comprehensive Income Loss Unrealized Gain Loss On Investments Net Of Tax AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnInvestmentsNetOfTax	15000000	USD
CY2011Q4	fe	Accumulated Other Comprehensive Income Loss Unrealized Gain Loss On Investments Net Of Tax AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnInvestmentsNetOfTax	19000000	USD
CY2011Q1	fe	Acquisition Equity Interests Issued Or Issuable Price Per Share AcquisitionEquityInterestsIssuedOrIssuablePricePerShare	38.16
CY2010	fe	Adjustment That Increased Income Tax Expense AdjustmentThatIncreasedIncomeTaxExpense	8000000	USD
CY2012Q4	fe	Adverse Percentage Change In Quoted Market Prices Derivative Instruments AdversePercentageChangeInQuotedMarketPricesDerivativeInstruments	-0.10
CY2012Q4	fe	Adverse Power Contract Liability AdversePowerContractLiability	506000000	USD
CY2011Q4	fe	Adverse Power Contract Liability AdversePowerContractLiability	469000000	USD
CY2012	fe	Amortization Of Nuclear Fuel Lease And Leased Assets AmortizationOfNuclearFuelLeaseAndLeasedAssets	210000000	USD
CY2010	fe	Amortization Of Nuclear Fuel Lease And Leased Assets AmortizationOfNuclearFuelLeaseAndLeasedAssets	168000000	USD
CY2011	fe	Amortization Of Nuclear Fuel Lease And Leased Assets AmortizationOfNuclearFuelLeaseAndLeasedAssets	201000000	USD
CY2011Q1	fe	Business Acquisition Equity Interest Issued Number Of Shares Issued BusinessAcquisitionEquityInterestIssuedNumberOfSharesIssued	113000000	shares
CY2011Q4	fe	Aspects Of Opinion Under Appeal AspectsOfOpinionUnderAppeal	1	aspect_of_opinion
CY2011	fe	Asset Retirement Obligation Reduction From Deconsolidation AssetRetirementObligationReductionFromDeconsolidation	10000000	USD
CY2012	fe	Basic Terms Of Operating Lease BasicTermsOfOperatingLease	P33Y
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Deferred Sale And Leaseback Gain DeferredTaxAssetsLiabilitiesNetNonCurrentDeferredSaleAndLeasebackGain	450000000	USD
CY2011	fe	Book Income Before Provision For Income Taxes BookIncomeBeforeProvisionForIncomeTaxes	1459000000	USD
CY2010	fe	Book Income Before Provision For Income Taxes BookIncomeBeforeProvisionForIncomeTaxes	1204000000	USD
CY2012	fe	Book Income Before Provision For Income Taxes BookIncomeBeforeProvisionForIncomeTaxes	1323000000	USD
CY2011Q1	fe	Business Acquisition Number Of Acquiree Common Stock Exchanged BusinessAcquisitionNumberOfAcquireeCommonStockExchanged	170000000	shares
CY2011Q1	fe	Business Acquisition Purchase Price Allocation Investments BusinessAcquisitionPurchasePriceAllocationInvestments	138000000	USD
CY2011	fe	Capital Leases Income Statement Other Expense CapitalLeasesIncomeStatementOtherExpense	46000000	USD
CY2010	fe	Capital Leases Income Statement Other Expense CapitalLeasesIncomeStatementOtherExpense	35000000	USD
CY2012	fe	Capital Leases Income Statement Other Expense CapitalLeasesIncomeStatementOtherExpense	52000000	USD
CY2012Q4	fe	Cash Receivables Payables Deferred Taxes Accrued Income Balance Excluded From Available For Sale Securities CashReceivablesPayablesDeferredTaxesAccruedIncomeBalanceExcludedFromAvailableForSaleSecurities	326000000	USD
CY2011Q4	fe	Cash Receivables Payables Deferred Taxes Accrued Income Balance Excluded From Available For Sale Securities CashReceivablesPayablesDeferredTaxesAccruedIncomeBalanceExcludedFromAvailableForSaleSecurities	164000000	USD
CY2012	fe	Change In Retained Earnings Accumulated Deficit Resulting From Change From Cost To Equity Method Investment ChangeInRetainedEarningsAccumulatedDeficitResultingFromChangeFromCostToEquityMethodInvestment	-9000000	USD
CY2010	fe	Change To Company Earnings Resulting From Retiree Healthcare Liabilities And Related Tax Impact Already Reflected In Consolidated Financial Statements ChangeToCompanyEarningsResultingFromRetireeHealthcareLiabilitiesAndRelatedTaxImpactAlreadyReflectedInConsolidatedFinancialStatements	13000000	USD
CY2010	fe	Cost Included As Repair Deduction Due To Change In Accounting Method CostIncludedAsRepairDeductionDueToChangeInAccountingMethod	325000000	USD
CY2012	fe	Coverage Of Decontamination Costs As Per Property Damage Insurance CoverageOfDecontaminationCostsAsPerPropertyDamageInsurance	2750000000	USD
CY2012	fe	Decrease Net Income Due To Adverse Change In Commodity Prices DecreaseNetIncomeDueToAdverseChangeInCommodityPrices	3000000	USD
CY2012Q4	fe	Deferred Compensation Arrangement With Individual Number Of Shares Available For Grant DeferredCompensationArrangementWithIndividualNumberOfSharesAvailableForGrant	988713	shares
CY2011	fe	Deferred Purchased Power Costs And Other DeferredPurchasedPowerCostsAndOther	-278000000	USD
CY2012	fe	Deferred Purchased Power Costs And Other DeferredPurchasedPowerCostsAndOther	-238000000	USD
CY2010	fe	Deferred Purchased Power Costs And Other DeferredPurchasedPowerCostsAndOther	-254000000	USD
CY2010	fe	Deferred Rents And Lease Market Valuation Liability DeferredRentsAndLeaseMarketValuationLiability	54000000	USD
CY2012	fe	Deferred Rents And Lease Market Valuation Liability DeferredRentsAndLeaseMarketValuationLiability	104000000	USD
CY2011	fe	Deferred Rents And Lease Market Valuation Liability DeferredRentsAndLeaseMarketValuationLiability	49000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current All Other DeferredTaxAssetsLiabilitiesNetNonCurrentAllOther	-208000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current All Other DeferredTaxAssetsLiabilitiesNetNonCurrentAllOther	-239000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Customer Receivables For Future Income Taxes DeferredTaxAssetsLiabilitiesNetNonCurrentCustomerReceivablesForFutureIncomeTaxes	-138000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Customer Receivables For Future Income Taxes DeferredTaxAssetsLiabilitiesNetNonCurrentCustomerReceivablesForFutureIncomeTaxes	-130000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Deferred Gain For Asset Sales Affiliated Companies DeferredTaxAssetsLiabilitiesNetNonCurrentDeferredGainForAssetSalesAffiliatedCompanies	0	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Deferred Gain For Asset Sales Affiliated Companies DeferredTaxAssetsLiabilitiesNetNonCurrentDeferredGainForAssetSalesAffiliatedCompanies	0	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Deferred Sale And Leaseback Gain DeferredTaxAssetsLiabilitiesNetNonCurrentDeferredSaleAndLeasebackGain	431000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Nuclear Decommissioning Activities DeferredTaxAssetsLiabilitiesNetNonCurrentNuclearDecommissioningActivities	-127000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Nuclear Decommissioning Activities DeferredTaxAssetsLiabilitiesNetNonCurrentNuclearDecommissioningActivities	-123000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Other Regulatory Assets Rcp DeferredTaxAssetsLiabilitiesNetNonCurrentOtherRegulatoryAssetsRcp	-165000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Lease Market Valuation Liability DeferredTaxAssetsLiabilitiesNetNonCurrentLeaseMarketValuationLiability	179000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Lease Market Valuation Liability DeferredTaxAssetsLiabilitiesNetNonCurrentLeaseMarketValuationLiability	81000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Loss Carry Forward Valuation Reserve DeferredTaxAssetsLiabilitiesNetNonCurrentLossCarryForwardValuationReserve	-102000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Loss Carry Forward Valuation Reserve DeferredTaxAssetsLiabilitiesNetNonCurrentLossCarryForwardValuationReserve	-34000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Loss Carry Forwards And Tax Credits DeferredTaxAssetsLiabilitiesNetNonCurrentLossCarryForwardsAndTaxCredits	612000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Loss Carry Forwards And Tax Credits DeferredTaxAssetsLiabilitiesNetNonCurrentLossCarryForwardsAndTaxCredits	1199000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Mark To Market Adjustments DeferredTaxAssetsLiabilitiesNetNonCurrentMarkToMarketAdjustments	7000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Mark To Market Adjustments DeferredTaxAssetsLiabilitiesNetNonCurrentMarkToMarketAdjustments	-30000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Non Utility Generation Costs DeferredTaxAssetsLiabilitiesNetNonCurrentNonUtilityGenerationCosts	-5000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Non Utility Generation Costs DeferredTaxAssetsLiabilitiesNetNonCurrentNonUtilityGenerationCosts	-36000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Other Regulatory Assets Rcp DeferredTaxAssetsLiabilitiesNetNonCurrentOtherRegulatoryAssetsRcp	-161000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Oyster Creek Securitization DeferredTaxAssetsLiabilitiesNetNonCurrentOysterCreekSecuritization	-75000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Oyster Creek Securitization DeferredTaxAssetsLiabilitiesNetNonCurrentOysterCreekSecuritization	-93000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Pension And Other Post Retirement Obligations DeferredTaxAssetsLiabilitiesNetNonCurrentPensionAndOtherPostRetirementObligations	752000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Pension And Other Post Retirement Obligations DeferredTaxAssetsLiabilitiesNetNonCurrentPensionAndOtherPostRetirementObligations	1102000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Property Basis Differences DeferredTaxAssetsLiabilitiesNetNonCurrentPropertyBasisDifferences	-7868000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Property Basis Differences DeferredTaxAssetsLiabilitiesNetNonCurrentPropertyBasisDifferences	-6738000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Regulatory Transition Charge DeferredTaxAssetsLiabilitiesNetNonCurrentRegulatoryTransitionCharge	-79000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Regulatory Transition Charge DeferredTaxAssetsLiabilitiesNetNonCurrentRegulatoryTransitionCharge	-105000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Unamortized Investment Tax Credits DeferredTaxAssetsLiabilitiesNetNonCurrentUnamortizedInvestmentTaxCredits	67000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Unamortized Investment Tax Credits DeferredTaxAssetsLiabilitiesNetNonCurrentUnamortizedInvestmentTaxCredits	72000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Non Current Unrealized Losses On Derivative Hedges DeferredTaxAssetsLiabilitiesNetNonCurrentUnrealizedLossesOnDerivativeHedges	21000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Non Current Unrealized Losses On Derivative Hedges DeferredTaxAssetsLiabilitiesNetNonCurrentUnrealizedLossesOnDerivativeHedges	21000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Noncurrent Deferred Miso Pjm Transmission Costs DeferredTaxAssetsLiabilitiesNetNoncurrentDeferredMisoPjmTransmissionCosts	-125000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Noncurrent Deferred Miso Pjm Transmission Costs DeferredTaxAssetsLiabilitiesNetNoncurrentDeferredMisoPjmTransmissionCosts	-51000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Noncurrent Market Transition Charge DeferredTaxAssetsLiabilitiesNetNoncurrentMarketTransitionCharge	-65000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Noncurrent Market Transition Charge DeferredTaxAssetsLiabilitiesNetNoncurrentMarketTransitionCharge	-17000000	USD
CY2012Q4	fe	Deferred Tax Assets Liabilities Net Noncurrent Storm Damage DeferredTaxAssetsLiabilitiesNetNoncurrentStormDamage	-192000000	USD
CY2011Q4	fe	Deferred Tax Assets Liabilities Net Noncurrent Storm Damage DeferredTaxAssetsLiabilitiesNetNoncurrentStormDamage	-55000000	USD
CY2011Q1	fe	Exchange Ratio To Calculate Number Of Shares To Be Received By Acquiree Company On Merger ExchangeRatioToCalculateNumberOfSharesToBeReceivedByAcquireeCompanyOnMerger	0.667
CY2012	fe	Expected Number Of Nuclear Power Plant Licensed To Operate ExpectedNumberOfNuclearPowerPlantLicensedToOperate	104	NuclearPowerPlants
CY2010	fe	Favourable Affect On Effective Tax Rate FavourableAffectOnEffectiveTaxRate	12000000	USD
CY2010	fe	Gain Loss On Partial Sale Of Joint Venture Interest GainLossOnPartialSaleOfJointVentureInterest	0	USD
CY2012	fe	Gain Loss On Partial Sale Of Joint Venture Interest GainLossOnPartialSaleOfJointVentureInterest	0	USD
CY2011	fe	Gain Loss On Partial Sale Of Joint Venture Interest GainLossOnPartialSaleOfJointVentureInterest	569000000	USD
CY2010	fe	Impairment Of Investments Held ImpairmentOfInvestmentsHeld	33000000	USD
CY2011	fe	Impairment Of Investments Held ImpairmentOfInvestmentsHeld	19000000	USD
CY2012	fe	Impairment Of Investments Held ImpairmentOfInvestmentsHeld	27000000	USD
CY2012	fe	Income Tax Reconciliation Change In Deferred State Apportionment Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredStateApportionmentTaxAssetsValuationAllowance	-50000000	USD
CY2011	fe	Income Tax Reconciliation State Unitary Taxes IncomeTaxReconciliationStateUnitaryTaxes	33000000	USD
CY2012Q4	fe	Insurance Coverage For Replacement Power Costs InsuranceCoverageForReplacementPowerCosts	1060000000	USD
CY2010	fe	Investment Income From Trusts InvestmentIncomeFromTrusts	79000000	USD
CY2011	fe	Investment Income From Trusts InvestmentIncomeFromTrusts	82000000	USD
CY2012	fe	Investment Income From Trusts InvestmentIncomeFromTrusts	70000000	USD
CY2012	fe	Investment Tax Credit Amortization InvestmentTaxCreditAmortization	-11000000	USD
CY2010	fe	Investment Tax Credit Amortization InvestmentTaxCreditAmortization	-9000000	USD
CY2011	fe	Investment Tax Credit Amortization InvestmentTaxCreditAmortization	-11000000	USD
CY2011Q4	fe	Investments Excludes Receivables Payables Deferred Taxes And Accrued Income InvestmentsExcludesReceivablesPayablesDeferredTaxesAndAccruedIncome	-52000000	USD
CY2012Q4	fe	Investments Excludes Receivables Payables Deferred Taxes And Accrued Income InvestmentsExcludesReceivablesPayablesDeferredTaxesAndAccruedIncome	110000000	USD
CY2011Q4	fe	Investments Not Required To Be Disclosed InvestmentsNotRequiredToBeDisclosed	693000000	USD
CY2012Q4	fe	Investments Not Required To Be Disclosed InvestmentsNotRequiredToBeDisclosed	644000000	USD
CY2012Q4	fe	Line Of Credit Facility Pcrb Related Amount Outstanding LineOfCreditFacilityPcrbRelatedAmountOutstanding	818000000	USD
	fe	Loss Contingency Number Of Allegations Remanded To Trial Court LossContingencyNumberOfAllegationsRemandedToTrialCourt	1	allegation
CY2012	fe	Losses In Excess Of Private Insurance Contributed For Each Nuclear Unit License LossesInExcessOfPrivateInsuranceContributedForEachNuclearUnitLicense	118000000	USD
CY2012	fe	Losses In Excess Of Private Insurance Contributed For Each Nuclear Unit License Per Unit LossesInExcessOfPrivateInsuranceContributedForEachNuclearUnitLicensePerUnit	18000000	USD
CY2012	fe	Merger Related Expenses MergerRelatedExpenses	1000000	USD
	fe	Merger Related Expenses MergerRelatedExpenses	58000000	USD
CY2012	fe	Minimum Equity To Total Capitalization Ratio To Be Maintained For Payment Of Capital Dividend MinimumEquityToTotalCapitalizationRatioToBeMaintainedForPaymentOfCapitalDividend	0.35
CY2012Q4	fe	Net Plant Excluding Construction Work In Progress NetPlantExcludingConstructionWorkInProgress	30610000000	USD
CY2011Q4	fe	Net Plant Excluding Construction Work In Progress NetPlantExcludingConstructionWorkInProgress	28283000000	USD
CY2012Q3	fe	Notional Amount Of Interest Rate Derivatives Executed In Period NotionalAmountOfInterestRateDerivativesExecutedInPeriod	1600000000	USD
CY2012	fe	Nuclear Incidence Liability Per Incident Of Parent And Subsidiary Companys Based On Their Present Nuclear Ownership And Leasehold Interests NuclearIncidenceLiabilityPerIncidentOfParentAndSubsidiaryCompanysBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterests	470000000	USD
CY2012	fe	Nuclear Incident Liability Not More Than In Any One Year Per Incident Of Parent And Subsidiary Companies Based On Their Present Nuclear Ownership And Leasehold Interests NuclearIncidentLiabilityNotMoreThanInAnyOneYearPerIncidentOfParentAndSubsidiaryCompaniesBasedOnTheirPresentNuclearOwnershipAndLeaseholdInterests	70000000	USD
CY2012	fe	Nuclear Insurance Policy Aggregate Indemnity NuclearInsurancePolicyAggregateIndemnity	2000000000	USD
CY2012	fe	Nuclear Insurance Policy Environmental Plan Submission Period NuclearInsurancePolicyEnvironmentalPlanSubmissionPeriod	P30D
CY2012	fe	Nuclear Insurance Policy Indemnification Waiting Period NuclearInsurancePolicyIndemnificationWaitingPeriod	P26W
CY2012	fe	Nuclear Insurance Policy Maximum Aggregate Assessments For Incidents At Any Covered Nuclear Facility NuclearInsurancePolicyMaximumAggregateAssessmentsForIncidentsAtAnyCoveredNuclearFacility	14000000	USD
CY2012Q4	fe	Number Of Money Pools NumberOfMoneyPools	2	money_pool
CY2012	fe	Number Of Restricted Stock Units Award NumberOfRestrictedStockUnitsAward	2	shares
CY2012	fe	Number Of Stock Based Compensation Programs NumberOfStockBasedCompensationPrograms	4	Forms
CY2012Q4	fe	Number Of Subsidiaries Converted From Corporations To Limited Liability Companies Llcs NumberOfSubsidiariesConvertedFromCorporationsToLimitedLiabilityCompaniesLlcs	2	subsidiary
CY2012	fe	Number Of Unregulated Subsidiaries Involved In Tax Judgment NumberOfUnregulatedSubsidiariesInvolvedInTaxJudgment	2	subsidiary
CY2010	fe	Number Of Variable Interest Contracts NumberOfVariableInterestContracts	2	contracts
CY2012	fe	Number Of Variable Interest Contracts NumberOfVariableInterestContracts	3	entities
CY2012	fe	Number Of Variable Interest Contracts NumberOfVariableInterestContracts	3	contracts
CY2011	fe	Number Of Variable Interest Contracts NumberOfVariableInterestContracts	4	contracts
CY2012	fe	Operating And Capital Leases Expenses OperatingAndCapitalLeasesExpenses	364000000	USD
CY2011	fe	Operating And Capital Leases Expenses OperatingAndCapitalLeasesExpenses	278000000	USD
CY2010	fe	Operating And Capital Leases Expenses OperatingAndCapitalLeasesExpenses	265000000	USD
CY2012Q4	fe	Operating Lease Commitments Net Present Value OperatingLeaseCommitmentsNetPresentValue	1200000000	USD
CY2012	fe	Operating Lease Term Of Other Subsidiaries OperatingLeaseTermOfOtherSubsidiaries	P30Y
CY2011	fe	Other Comprehensive Income Reclassification Adjustment Tax Portion OtherComprehensiveIncomeReclassificationAdjustmentTaxPortion	72000000	USD
CY2010	fe	Other Comprehensive Income Reclassification Adjustment Tax Portion OtherComprehensiveIncomeReclassificationAdjustmentTaxPortion	40000000	USD
CY2012	fe	Other Comprehensive Income Reclassification Adjustment Tax Portion OtherComprehensiveIncomeReclassificationAdjustmentTaxPortion	101000000	USD
CY2010	fe	Other Comprehensive Income Reclassification Adjustment Total Before Tax OtherComprehensiveIncomeReclassificationAdjustmentTotalBeforeTax	106000000	USD
CY2012	fe	Other Comprehensive Income Reclassification Adjustment Total Before Tax OtherComprehensiveIncomeReclassificationAdjustmentTotalBeforeTax	263000000	USD
CY2011	fe	Other Comprehensive Income Reclassification Adjustment Total Before Tax OtherComprehensiveIncomeReclassificationAdjustmentTotalBeforeTax	190000000	USD
CY2012	fe	Period In Which Lses May Request Direct Allocation Of Ftrs PeriodInWhichLsesMayRequestDirectAllocationOfFtrs	P2Y
CY2012	fe	Portion Of Insurance Coverage By Industry Retrospective Rating Plan PortionOfInsuranceCoverageByIndustryRetrospectiveRatingPlan	12200000000	USD
CY2012	fe	Portion Of Insurance Coverage Of Private Insurer Included In Single Nuclear Incident Liability PortionOfInsuranceCoverageOfPrivateInsurerIncludedInSingleNuclearIncidentLiability	375000000	USD
CY2012Q4	fe	Preference Stock Shares Outstanding PreferenceStockSharesOutstanding	0	shares
CY2011Q4	fe	Preference Stock Shares Outstanding PreferenceStockSharesOutstanding	0	shares
CY2011Q4	fe	Unamortized Gains Or Losses Associated With Designated Cash Flow Hedges UnamortizedGainsOrLossesAssociatedWithDesignatedCashFlowHedges	19000000	USD
CY2012Q4	fe	Pretax Net Operating Loss Carryforwards Expected To Utilized PretaxNetOperatingLossCarryforwardsExpectedToUtilized	13700000000	USD
CY2012	fe	Principal Default Amount Specified In Debt Covenants PrincipalDefaultAmountSpecifiedInDebtCovenants	100000000	USD
CY2012Q3	fe	Proceeds From Interest Rate Derivative Termination ProceedsFromInterestRateDerivativeTermination	6000000	USD
CY2011Q4	fe	Property Plant And Equipment Excluding Construction In Progress PropertyPlantAndEquipmentExcludingConstructionInProgress	40122000000	USD
CY2012Q4	fe	Property Plant And Equipment Excluding Construction In Progress PropertyPlantAndEquipmentExcludingConstructionInProgress	43210000000	USD
CY2012	fe	Public Utilities Liability Asses With Respect To Single Nuclear Incident Based On Act PublicUtilitiesLiabilityAssesWithRespectToSingleNuclearIncidentBasedOnAct	12600000000	USD
CY2011	fe	Reclassification To Net Income ReclassificationToNetIncome	118000000	USD
CY2012	fe	Reclassification To Net Income ReclassificationToNetIncome	162000000	USD
CY2010	fe	Reclassification To Net Income ReclassificationToNetIncome	66000000	USD
CY2011	fe	Reclassifications From Accumulated Other Comprehensive Loss Into Other Operating Expense ReclassificationsFromAccumulatedOtherComprehensiveLossIntoOtherOperatingExpense	-26000000	USD
CY2012	fe	Reclassifications From Accumulated Other Comprehensive Loss Into Other Operating Expense ReclassificationsFromAccumulatedOtherComprehensiveLossIntoOtherOperatingExpense	9000000	USD
CY2011	fe	Recognized Tax Benefits RecognizedTaxBenefits	30000000	USD
CY2010	fe	Reduction In Effective Tax Rate ReductionInEffectiveTaxRate	6000000	USD
CY2012	fe	Reduction In Effective Tax Rate ReductionInEffectiveTaxRate	4000000	USD
CY2011	fe	Reduction In Effective Tax Rate ReductionInEffectiveTaxRate	7000000	USD
CY2012	fe	Regional Enforcement Entities RegionalEnforcementEntities	8	entities
CY2010	fe	Removal Costs RemovalCosts	18000000	USD
CY2011	fe	Removal Costs RemovalCosts	55000000	USD
CY2012	fe	Removal Costs RemovalCosts	203000000	USD
CY2012	fe	Reportable Operating Segments ReportableOperatingSegments	3	Segments
CY2012	fe	Retrospective Assessments Liabilities RetrospectiveAssessmentsLiabilities	69000000	USD
CY2012Q4	fe	Unamortized Gains Included In Long Term Debt Associated With Prior Fixed For Floating Interest Rate Swap Agreements UnamortizedGainsIncludedInLongTermDebtAssociatedWithPriorFixedForFloatingInterestRateSwapAgreements	79000000	USD
CY2011Q4	fe	Unamortized Gains Included In Long Term Debt Associated With Prior Fixed For Floating Interest Rate Swap Agreements UnamortizedGainsIncludedInLongTermDebtAssociatedWithPriorFixedForFloatingInterestRateSwapAgreements	102000000	USD
CY2011	fe	Storm Cost Deferral StormCostDeferral	145000000	USD
CY2010	fe	Storm Cost Deferral StormCostDeferral	14000000	USD
CY2012	fe	Storm Cost Deferral StormCostDeferral	375000000	USD
CY2012	fe	Subsidiary One Operating Lease Term Of Subsidiary One SubsidiaryOneOperatingLeaseTermOfSubsidiaryOne	P29Y
CY2011	fe	Tax Benefits Affecting Effective Tax Rate TaxBenefitsAffectingEffectiveTaxRate	5000000	USD
CY2012Q4	fe	Unamortized Gains Or Losses Associated With Designated Cash Flow Hedges UnamortizedGainsOrLossesAssociatedWithDesignatedCashFlowHedges	10000000	USD
CY2011Q4	fe	Unamortized Losses Associated With Prior Interest Rate Hedges UnamortizedLossesAssociatedWithPriorInterestRateHedges	79000000	USD
CY2012Q4	fe	Unamortized Losses Associated With Prior Interest Rate Hedges UnamortizedLossesAssociatedWithPriorInterestRateHedges	70000000	USD
CY2010	fe	Uncertain Tax Position Net Interest Expense Income UncertainTaxPositionNetInterestExpenseIncome	-10000000	USD
CY2012	fe	Uncertain Tax Position Net Interest Expense Income UncertainTaxPositionNetInterestExpenseIncome	-4000000	USD
CY2011	fe	Uncertain Tax Position Net Interest Expense Income UncertainTaxPositionNetInterestExpenseIncome	-5000000	USD
CY2012Q4	fe	Uncertain Tax Position Net Interest Payable Receivable UncertainTaxPositionNetInterestPayableReceivable	8000000	USD
CY2011Q4	fe	Uncertain Tax Position Net Interest Payable Receivable UncertainTaxPositionNetInterestPayableReceivable	11000000	USD
CY2012Q4	fe	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities Resulting Reduction To Effective Tax Rate UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthoritiesResultingReductionToEffectiveTaxRate	10000000	USD
CY2012Q4	fe	Unrecognized Tax Benefits Portion Expected To Be Resolved In Next Fiscal Year UnrecognizedTaxBenefitsPortionExpectedToBeResolvedInNextFiscalYear	4000000	USD
CY2012	fe	Variable Interest Entities Percentage Of Equity Interest By Unaffiliated Third Party Included In Ownership Of Entity Three VariableInterestEntitiesPercentageOfEquityInterestByUnaffiliatedThirdPartyIncludedInOwnershipOfEntityThree	0.03
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001031296
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	418216437	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	20518723171	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	FIRSTENERGY CORP
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

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$FE
FirstEnergy Corp Stock $fe

2011 Q4 Form 10-K Financial Statement

#000103129613000010 Filed on February 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FE FirstEnergy Corp Stock $fe

2011 Q4 Form 10-K Financial Statement

#000103129613000010 Filed on February 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FE
FirstEnergy Corp Stock $fe