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Subsequent Event (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Business Combination, Bargain Purchase [Abstract]    
Payments To Acquire Businesses Gross $ 66,000,000 $ 3,000,000
LineOfCreditFacilityMaximumBorrowingCapacity 8,500,000,000  
Pepco Holdings [Member]
   
Business Combination, Bargain Purchase [Abstract]    
CashFundingFromNonCoreAssetSale 1,000,000  
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  
PECO Energy Co [Member]
   
Storm Damage Impact [Abstract]    
Incremental operating and maintenance expense from storm damage (low estimate) 10,000,000  
Incremental operating and maintenance expense from storm damage (high estimate) 20,000,000  
Incremental capital expenditures from storm damage (low estimate) 10,000,000  
Incremental capital expenditures from storm damage (high estimate) 20,000,000  
Exelon Generation Co L L C [Member]
   
Business Combination, Bargain Purchase [Abstract]    
Payments To Acquire Businesses Gross (66,000,000)  
Exelon Generation Co L L C [Member] | Subsequent Event [Member]
   
BusinessCombinationsAbstract    
PaymentsToAcquireBusinessesNetOfCashAcquired 60,000,000  
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Working Capital $ 183,000,000