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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance $ 163 $ 191 $ 174 $ 171
Other comprehensive income before reclassifications 27 21 63 109
Amounts reclassified from AOCI (48) (33) (102) (90)
Other comprehensive income (loss) (21) (12) (39) 19
Income taxes (benefits) on other comprehensive income (loss) (9) (5) (16) 6
Other comprehensive income (loss), net of tax (12) (7) (23) 13
AOCI Ending Balance 151 184 151 184
Gains & Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance (26) (31) (28) (33)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI 4 2 8 6
Other comprehensive income (loss) 4 2 8 6
Income taxes (benefits) on other comprehensive income (loss) 1 0 3 2
Other comprehensive income (loss), net of tax 3 2 5 4
AOCI Ending Balance (23) (29) (23) (29)
Unrealized Gains on AFS Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 61 58 52 18
Other comprehensive income before reclassifications 27 21 63 109
Amounts reclassified from AOCI (33) (17) (55) (42)
Other comprehensive income (loss) (6) 4 8 67
Income taxes (benefits) on other comprehensive income (loss) (3) 2 2 25
Other comprehensive income (loss), net of tax (3) 2 6 42
AOCI Ending Balance 58 60 58 60
Defined Benefit Pension & OPEB Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 128 164 150 186
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI (19) (18) (55) (54)
Other comprehensive income (loss) (19) (18) (55) (54)
Income taxes (benefits) on other comprehensive income (loss) (7) (7) (21) (21)
Other comprehensive income (loss), net of tax (12) (11) (34) (33)
AOCI Ending Balance 116 153 116 153
FES        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 79 75 69 46
Other comprehensive income before reclassifications 27 22 70 102
Amounts reclassified from AOCI (35) (19) (63) (51)
Other comprehensive income (loss) (8) 3 7 51
Income taxes (benefits) on other comprehensive income (loss) (3) 1 2 20
Other comprehensive income (loss), net of tax (5) 2 5 31
AOCI Ending Balance 74 77 74 77
FES | Gains & Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance (9) (10) (9) (9)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI 1 1 1 0
Other comprehensive income (loss) 1 1 1 0
Income taxes (benefits) on other comprehensive income (loss) 0 0 0 0
Other comprehensive income (loss), net of tax 1 1 1 0
AOCI Ending Balance (8) (9) (8) (9)
FES | Unrealized Gains on AFS Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 62 50 48 16
Other comprehensive income before reclassifications 27 22 70 102
Amounts reclassified from AOCI (33) (17) (54) (41)
Other comprehensive income (loss) (6) 5 16 61
Income taxes (benefits) on other comprehensive income (loss) (2) 2 6 24
Other comprehensive income (loss), net of tax (4) 3 10 37
AOCI Ending Balance 58 53 58 53
FES | Defined Benefit Pension & OPEB Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 26 35 30 39
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI (3) (3) (10) (10)
Other comprehensive income (loss) (3) (3) (10) (10)
Income taxes (benefits) on other comprehensive income (loss) (1) (1) (4) (4)
Other comprehensive income (loss), net of tax (2) (2) (6) (6)
AOCI Ending Balance $ 24 $ 33 $ 24 $ 33