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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
AOCI Beginning Balance $ 174 $ 171
Other comprehensive income before reclassifications 32 41
Amounts reclassified from AOCI (31) (29)
Other comprehensive income 1 12
Income taxes (benefits) on other comprehensive income (loss) 0 4
Other comprehensive income, net of tax 1 8
AOCI Ending Balance 175 179
Gains & Losses on Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
AOCI Beginning Balance (28) (33)
Other comprehensive income before reclassifications 0 0
Amounts reclassified from AOCI 3 2
Other comprehensive income 3 2
Income taxes (benefits) on other comprehensive income (loss) 1 1
Other comprehensive income, net of tax 2 1
AOCI Ending Balance (26) (32)
Unrealized Gains on AFS Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
AOCI Beginning Balance 52 18
Other comprehensive income before reclassifications 32 41
Amounts reclassified from AOCI (16) (13)
Other comprehensive income 16 28
Income taxes (benefits) on other comprehensive income (loss) 5 10
Other comprehensive income, net of tax 11 18
AOCI Ending Balance 63 36
Defined Benefit Pension & OPEB Plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
AOCI Beginning Balance 150 186
Other comprehensive income before reclassifications 0 0
Amounts reclassified from AOCI (18) (18)
Other comprehensive income (18) (18)
Income taxes (benefits) on other comprehensive income (loss) (6) (7)
Other comprehensive income, net of tax (12) (11)
AOCI Ending Balance 138 175
FES    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
AOCI Beginning Balance 69 46
Other comprehensive income before reclassifications 31 36
Amounts reclassified from AOCI (18) (17)
Other comprehensive income 13 19
Income taxes (benefits) on other comprehensive income (loss) 5 7
Other comprehensive income, net of tax 8 12
AOCI Ending Balance 77 58
FES | Gains & Losses on Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
AOCI Beginning Balance (9) (9)
Other comprehensive income before reclassifications 0 0
Amounts reclassified from AOCI 0 0
Other comprehensive income 0 0
Income taxes (benefits) on other comprehensive income (loss) 0 0
Other comprehensive income, net of tax 0 0
AOCI Ending Balance (9) (9)
FES | Unrealized Gains on AFS Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
AOCI Beginning Balance 48 16
Other comprehensive income before reclassifications 31 36
Amounts reclassified from AOCI (15) (13)
Other comprehensive income 16 23
Income taxes (benefits) on other comprehensive income (loss) 6 9
Other comprehensive income, net of tax 10 14
AOCI Ending Balance 58 30
FES | Defined Benefit Pension & OPEB Plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
AOCI Beginning Balance 30 39
Other comprehensive income before reclassifications 0 0
Amounts reclassified from AOCI (3) (4)
Other comprehensive income (3) (4)
Income taxes (benefits) on other comprehensive income (loss) (1) (2)
Other comprehensive income, net of tax (2) (2)
AOCI Ending Balance $ 28 $ 37