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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance $ 175 $ 179 $ 174 $ 171
Other comprehensive income before reclassifications 4 47 36 88
Amounts reclassified from AOCI (23) (28) (54) (57)
Other comprehensive income (loss) (19) 19 (18) 31
Income taxes (benefits) on other comprehensive income (loss) (7) 7 (7) 11
Other comprehensive income (loss), net of tax (12) 12 (11) 20
AOCI Ending Balance 163 191 163 191
Gains & Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance (26) (32) (28) (33)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI 1 2 4 4
Other comprehensive income (loss) 1 2 4 4
Income taxes (benefits) on other comprehensive income (loss) 1 1 2 2
Other comprehensive income (loss), net of tax 0 1 2 2
AOCI Ending Balance (26) (31) (26) (31)
Unrealized Gains on AFS Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 63 36 52 18
Other comprehensive income before reclassifications 4 47 36 88
Amounts reclassified from AOCI (6) (12) (22) (25)
Other comprehensive income (loss) (2) 35 14 63
Income taxes (benefits) on other comprehensive income (loss) 0 13 5 23
Other comprehensive income (loss), net of tax (2) 22 9 40
AOCI Ending Balance 61 58 61 58
Defined Benefit Pension & OPEB Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 138 175 150 186
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI (18) (18) (36) (36)
Other comprehensive income (loss) (18) (18) (36) (36)
Income taxes (benefits) on other comprehensive income (loss) (8) (7) (14) (14)
Other comprehensive income (loss), net of tax (10) (11) (22) (22)
AOCI Ending Balance 128 164 128 164
FES        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 77 58 69 46
Other comprehensive income before reclassifications 12 44 43 80
Amounts reclassified from AOCI (10) (15) (28) (32)
Other comprehensive income (loss) 2 29 15 48
Income taxes (benefits) on other comprehensive income (loss) 0 12 5 19
Other comprehensive income (loss), net of tax 2 17 10 29
AOCI Ending Balance 79 75 79 75
FES | Gains & Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance (9) (9) (9) (9)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 (1) 0 (1)
Other comprehensive income (loss) 0 (1) 0 (1)
Income taxes (benefits) on other comprehensive income (loss) 0 0 0 0
Other comprehensive income (loss), net of tax 0 (1) 0 (1)
AOCI Ending Balance (9) (10) (9) (10)
FES | Unrealized Gains on AFS Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 58 30 48 16
Other comprehensive income before reclassifications 12 44 43 80
Amounts reclassified from AOCI (6) (11) (21) (24)
Other comprehensive income (loss) 6 33 22 56
Income taxes (benefits) on other comprehensive income (loss) 2 13 8 22
Other comprehensive income (loss), net of tax 4 20 14 34
AOCI Ending Balance 62 50 62 50
FES | Defined Benefit Pension & OPEB Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 28 37 30 39
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI (4) (3) (7) (7)
Other comprehensive income (loss) (4) (3) (7) (7)
Income taxes (benefits) on other comprehensive income (loss) (2) (1) (3) (3)
Other comprehensive income (loss), net of tax (2) (2) (4) (4)
AOCI Ending Balance $ 26 $ 35 $ 26 $ 35