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Supplemental Guarantor Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Consolidating Statements of Income        
Revenues [1] $ 3,309 $ 3,401 $ 6,861 $ 7,270
OPERATING EXPENSES:        
Fuel 343 438 711 819
Purchased power 735 889 1,598 2,013
Other operating expenses 957 964 2,099 1,882
Provision for depreciation 281 334 556 663
General taxes 253 241 524 521
Impairment of assets 131 1,447 131 1,447
Total operating expenses 2,765 4,376 5,743 7,469
OPERATING INCOME (LOSS) 544 (975) 1,118 (199)
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 17 19 41 47
Interest expense (290) (289) (577) (577)
Capitalized interest 20 26 40 51
Total other expense (253) (244) (496) (479)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) 291 (1,219) 622 (678)
INCOME TAXES (BENEFITS) 117 (130) 243 83
NET INCOME (LOSS) 174 (1,089) 379 (761)
NET INCOME 174 (1,089) 379 (761)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (18) (18) (36) (36)
Amortized gains on derivative hedges 1 2 4 4
Change in unrealized gains on available-for-sale securities (2) 35 14 63
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
COMPREHENSIVE INCOME (LOSS) $ 162 (1,077) $ 368 (741)
Bruce Mansfield Unit 1        
Condensed Financial Statements, Captions [Line Items]        
Percentage of undivided interest of non guarantor subsidiary 93.83%   93.83%  
Eliminations        
Consolidating Statements of Income        
Revenues $ (810) (832) $ (1,348) (1,734)
OPERATING EXPENSES:        
Fuel 0 0 0 0
Other operating expenses 12 14 24 26
Provision for depreciation (1) (1) (1) (2)
General taxes 0 0 0 0
Impairment of assets   0   0
Total operating expenses (799) (819) (1,325) (1,710)
OPERATING INCOME (LOSS) (11) (13) (23) (24)
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees (263) 153 (262) (106)
Miscellaneous income   0 0 0
Capitalized interest 0 0 0 0
Total other expense (230) 181 (195) (53)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) (241) 168 (218) (77)
INCOME TAXES (BENEFITS) 1 1 2 2
NET INCOME (LOSS) (242) 167 (220) (79)
NET INCOME (242) 167 (220) (79)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs 4 4 7 7
Amortized gains on derivative hedges   0   0
Change in unrealized gains on available-for-sale securities (6) (32) (22) (55)
Other comprehensive income (loss) (2) (28) (15) (48)
Income taxes (benefits) on other comprehensive income (loss) 0 (11) (5) (18)
Other comprehensive income (loss), net of tax (2) (17) (10) (30)
COMPREHENSIVE INCOME (LOSS) (244) 150 (230) (109)
Eliminations | Affiliates        
OPERATING EXPENSES:        
Purchased power (810) (832) (1,348) (1,734)
OTHER INCOME (EXPENSE):        
Interest expense 19 13 39 24
Eliminations | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense 14 15 28 29
FES        
Consolidating Statements of Income        
Revenues 717 1,061 1,597 2,216
OPERATING EXPENSES:        
Fuel 0 0 0 0
Other operating expenses 63 119 177 123
Provision for depreciation 3 3 6 6
General taxes 5 7 11 15
Impairment of assets   23   23
Total operating expenses 1,038 1,368 1,984 2,687
OPERATING INCOME (LOSS) (321) (307) (387) (471)
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 247 (163) 229 86
Miscellaneous income   1 0 3
Capitalized interest 0 0 0 0
Total other expense 215 (187) 168 42
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) (106) (494) (219) (429)
INCOME TAXES (BENEFITS) (125) (56) (158) (122)
NET INCOME (LOSS) 19 (438) (61) (307)
NET INCOME 19 (438) (61) (307)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (4) (3) (7) (7)
Amortized gains on derivative hedges   (1)   (1)
Change in unrealized gains on available-for-sale securities 6 33 22 56
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
COMPREHENSIVE INCOME (LOSS) 21 (421) (51) (278)
FES | Affiliates        
OPERATING EXPENSES:        
Purchased power 811 950 1,474 1,877
OTHER INCOME (EXPENSE):        
Interest expense (20) (12) (38) (21)
FES | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 156 266 316 643
OTHER INCOME (EXPENSE):        
Interest expense (12) (13) (23) (26)
FG        
Consolidating Statements of Income        
Revenues 474 400 710 815
OPERATING EXPENSES:        
Fuel 106 181 204 300
Other operating expenses 58 88 283 159
Provision for depreciation 9 32 16 63
General taxes 5 6 13 16
Impairment of assets   517   517
Total operating expenses 178 824 516 1,055
OPERATING INCOME (LOSS) 296 (424) 194 (240)
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 10 7 20 13
Miscellaneous income   0 0 0
Capitalized interest 0 2 1 4
Total other expense (19) (19) (38) (39)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) 277 (443) 156 (279)
INCOME TAXES (BENEFITS) 102 (149) 60 (88)
NET INCOME (LOSS) 175 (294) 96 (191)
NET INCOME 175 (294) 96 (191)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (4) (4) (7) (7)
Amortized gains on derivative hedges   0   0
Change in unrealized gains on available-for-sale securities 0 0 0 0
Other comprehensive income (loss) (4) (4) (7) (7)
Income taxes (benefits) on other comprehensive income (loss) (2) (2) (3) (3)
Other comprehensive income (loss), net of tax (2) (2) (4) (4)
COMPREHENSIVE INCOME (LOSS) 173 (296) 92 (195)
FG | Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (3) (2) (6) (4)
FG | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (26) (26) (53) (52)
NG        
Consolidating Statements of Income        
Revenues 360 473 696 1,004
OPERATING EXPENSES:        
Fuel 48 47 94 93
Other operating expenses 153 148 320 301
Provision for depreciation 16 50 31 100
General taxes 8 6 15 14
Impairment of assets   0   0
Total operating expenses 263 300 536 614
OPERATING INCOME (LOSS) 97 173 160 390
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 21 22 48 39
Miscellaneous income   0 5 0
Capitalized interest 6 6 13 14
Total other expense 15 15 42 27
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) 112 188 202 417
INCOME TAXES (BENEFITS) 45 61 78 147
NET INCOME (LOSS) 67 127 124 270
NET INCOME 67 127 124 270
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs 0 0 0 0
Amortized gains on derivative hedges   0   0
Change in unrealized gains on available-for-sale securities 6 32 22 55
Other comprehensive income (loss) 6 32 22 55
Income taxes (benefits) on other comprehensive income (loss) 2 13 8 21
Other comprehensive income (loss), net of tax 4 19 14 34
COMPREHENSIVE INCOME (LOSS) 71 146 138 304
NG | Affiliates        
OPERATING EXPENSES:        
Purchased power 38 49 76 106
OTHER INCOME (EXPENSE):        
Interest expense (1) 0 (2) (2)
NG | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (11) (13) (22) (24)
Consolidated        
Consolidating Statements of Income        
Revenues 741 1,102 1,655 2,301
OPERATING EXPENSES:        
Fuel 154 228 298 393
Other operating expenses 286 369 804 609
Provision for depreciation 27 84 52 167
General taxes 18 19 39 45
Impairment of assets 0 540 0 540
Total operating expenses 680 1,673 1,711 2,646
OPERATING INCOME (LOSS) 61 (571) (56) (345)
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 15 19 35 32
Miscellaneous income 0 1 5 3
Capitalized interest 6 8 14 18
Total other expense (19) (10) (23) (23)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) 42 (581) (79) (368)
INCOME TAXES (BENEFITS) 23 (143) (18) (61)
NET INCOME (LOSS) 19 (438) (61) (307)
NET INCOME 19 (438) (61) (307)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (4) (3) (7) (7)
Amortized gains on derivative hedges 0 (1) 0 (1)
Change in unrealized gains on available-for-sale securities 6 33 22 56
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
COMPREHENSIVE INCOME (LOSS) 21 (421) (51) (278)
Consolidated | Affiliates        
OPERATING EXPENSES:        
Purchased power 39 167 202 249
OTHER INCOME (EXPENSE):        
Interest expense (5) (1) (7) (3)
Consolidated | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 156 266 316 643
OTHER INCOME (EXPENSE):        
Interest expense $ (35) $ (37) $ (70) $ (73)
[1] Includes excise tax collections of $91 million and $92 million in the three months ended June 30, 2017 and 2016, respectively, and $191 million and $199 million in the six months ended June 30, 2017 and 2016, respectively.