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Subsequent Event (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Business Combination, Bargain Purchase [Abstract]  
LineOfCreditFacilityMaximumBorrowingCapacity $ 8,400,000,000
CashFundingFromNonCoreAssetSale 1,000,000,000
Pepco Holdings [Member]
 
Business Combination, Bargain Purchase [Abstract]  
Payments To Acquire Businesses Gross 27.25
LineOfCreditFacilityMaximumBorrowingCapacity 7,200,000,000
BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCosts 90,000,000
DebtFundingPercentage 50.00%
OtherlongtermInvestments 18,000,000
Business Combination Proposed Customer Benefits Package 100,000,000
OtherLongTermInvestmentsMaximum 180,000,000
Pepco Holdings [Member] | Maximum [Member]
 
Business Combination, Bargain Purchase [Abstract]  
BusinessExitCosts 293,000,000
Pepco Holdings [Member] | Minimum [Member]
 
Business Combination, Bargain Purchase [Abstract]  
BusinessExitCosts $ 259,000,000