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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance $ 73 $ 163 $ 142 $ 174
Other comprehensive income before reclassifications   27 (97) 63
Amounts reclassified from AOCI (16) (48) (50) (102)
Deconsolidation of FES and FENOC     5  
Other comprehensive loss (16) (21) (142) (39)
Income taxes (benefits) on other comprehensive income (loss) (4) (9) (61) (16)
Other comprehensive loss, net of tax (12) (12) (81) (23)
AOCI Ending Balance 61 151 61 151
Gains & Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance (14) (26) (22) (28)
Other comprehensive income before reclassifications   0 0 0
Amounts reclassified from AOCI 2 4 6 8
Deconsolidation of FES and FENOC     13  
Other comprehensive loss 2 4 19 8
Income taxes (benefits) on other comprehensive income (loss) 0 1 9 3
Other comprehensive loss, net of tax 2 3 10 5
AOCI Ending Balance (12) (23) (12) (23)
Unrealized Gains on AFS Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 0 61 67 52
Other comprehensive income before reclassifications   27 (97) 63
Amounts reclassified from AOCI 0 (33) (1) (55)
Deconsolidation of FES and FENOC     (8)  
Other comprehensive loss 0 (6) (106) 8
Income taxes (benefits) on other comprehensive income (loss) 0 (3) (39) 2
Other comprehensive loss, net of tax 0 (3) (67) 6
AOCI Ending Balance 0 58 0 58
Defined Benefit Pension & OPEB Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI Beginning Balance 87 128 97 150
Other comprehensive income before reclassifications   0 0 0
Amounts reclassified from AOCI (18) (19) (55) (55)
Deconsolidation of FES and FENOC     0  
Other comprehensive loss (18) (19) (55) (55)
Income taxes (benefits) on other comprehensive income (loss) (4) (7) (31) (21)
Other comprehensive loss, net of tax (14) (12) (24) (34)
AOCI Ending Balance $ 73 $ 116 $ 73 $ 116