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Fair Value Measurements (Details 1) - Level 3 - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
NUG contracts    
Reconciliation of changes in the fair value of FTRs contracts    
Beginning Balance, Derivative Assets $ 1 $ 2
Beginning Balance, Derivative Liabilities (137) (153)
Beginning Balance, Net (136) (151)
Unrealized gain (loss), Derivative Assets 0 2
Unrealized gain (loss), Derivative Liabilities (11) (49)
Unrealized gain (loss), Net (11) (47)
Purchases, Derivative Assets 0 0
Purchases, Derivative Liabilities 0 0
Purchases, Net 0 0
Settlements, Derivative Assets 0 (3)
Settlements, Derivative Liabilities 24 65
Settlements, Net 24 62
Ending Balance, Derivative Assets 1 1
Ending Balance, Derivative Liabilities (124) (137)
Ending Balance, Net (123) (136)
FTRs    
Reconciliation of changes in the fair value of FTRs contracts    
Beginning Balance, Derivative Assets 8 39
Beginning Balance, Derivative Liabilities (13) (14)
Beginning Balance, Net (5) 25
Unrealized gain (loss), Derivative Assets 0 (5)
Unrealized gain (loss), Derivative Liabilities (1) (7)
Unrealized gain (loss), Net (1) (12)
Purchases, Derivative Assets 15 22
Purchases, Derivative Liabilities (7) (11)
Purchases, Net 8 11
Settlements, Derivative Assets (6) (48)
Settlements, Derivative Liabilities 13 19
Settlements, Net 7 (29)
Ending Balance, Derivative Assets 17 8
Ending Balance, Derivative Liabilities (8) (13)
Ending Balance, Net 9 (5)
FTRs | FES    
Reconciliation of changes in the fair value of FTRs contracts    
Beginning Balance, Derivative Assets 5 27
Beginning Balance, Derivative Liabilities (11) (13)
Beginning Balance, Net (6) 14
Unrealized gain (loss), Derivative Assets 0 2
Unrealized gain (loss), Derivative Liabilities (1) (5)
Unrealized gain (loss), Net (1) (3)
Purchases, Derivative Assets 9 9
Purchases, Derivative Liabilities (4) (10)
Purchases, Net 5 (1)
Settlements, Derivative Assets (2) (33)
Settlements, Derivative Liabilities 11 17
Settlements, Net 9 (16)
Ending Balance, Derivative Assets 12 5
Ending Balance, Derivative Liabilities (5) (11)
Ending Balance, Net $ 7 $ (6)