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Derivative Financial Instruments - Summary of Gains and Losses on Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]        
Gain (Loss) on Swaps/Borrowings $ (3)      
Interest Expense [Member] | Fair Value Hedging [Member]        
Derivative [Line Items]        
Gain (Loss) on Swaps/Borrowings   $ 23 $ 14 $ (1)
Interest Expense [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member]        
Derivative [Line Items]        
Gain (Loss) on Swaps/Borrowings   (9) 3 14
Interest Expense [Member] | Fair Value Hedging [Member] | Exelon Generation Co L L C [Member]        
Derivative [Line Items]        
Gain (Loss) on Swaps/Borrowings [1]   0 0 2
Interest Expense [Member] | Fair Value Hedging [Member] | Exelon Generation Co L L C [Member] | Interest Rate Swap [Member]        
Derivative [Line Items]        
Gain (Loss) on Swaps/Borrowings [1]   $ 0 (1) (16)
Gain (Loss) on Fair Value Hedges Recognized in Earnings     $ (1) (17)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net       $ 4
[1] For the years ended December 31, 2015 and 2014, the loss on Generation swaps included $(1) million and $(17) million realized in earnings, respectively, with an immaterial amount and $4 million excluded from hedge effectiveness testing, respectively.