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Derivative Financial Instruments - Summary of Proprietary Trading Activities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative [Line Items]        
Unrealized Gain (Loss) on Commodity Contracts $ 207 $ (42) $ 163 $ 350
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (118) (97) (267) (98)
Unrealized Gain (Loss) on Derivatives     (100) 363
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge 1 2 (3) 48
Operating Revenue [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Derivatives and Commodity Contracts (1) (6) 1 (5)
Exelon Generation Co L L C [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Commodity Contracts 207 (42) 163 350
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (118) (97) (267) (98)
Unrealized Gain (Loss) on Derivatives     (112) 252
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge 1 2 (3) 12
Commodity Contract [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Derivatives 89 (139) (104) 252
Commodity Contract [Member] | Operating Revenue [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Commodity Contracts 4 (4) 18 5
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (6) (2) (17) (8)
Unrealized Gain (Loss) on Derivatives (2) (6) 1 (3)
Commodity Contract [Member] | Exelon Generation Co L L C [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Derivatives 89 (139) (104) 252
Foreign Exchange Contract [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (2) (2) (6) 58
Unrealized Gain (Loss) on Derivatives (1) 0 (9) 106
Unrealized Gain (Loss) on Derivatives and Commodity Contracts 88 (139) (113) 358
Foreign Exchange Contract [Member] | Operating Revenue [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 1 (3) 2 (9)
Unrealized Gain (Loss) on Derivatives 1 0 0 (2)
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge 0 3 (2) 7
Foreign Exchange Contract [Member] | Exelon Generation Co L L C [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (2) (2) (6) (6)
Unrealized Gain (Loss) on Derivatives (1) 0 (9) 6
Unrealized Gain (Loss) on Derivatives and Commodity Contracts $ 88 $ (139) $ (113) $ 258