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Supplemental Guarantor Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidating Statements of Income                      
REVENUES $ 3,375 $ 3,917 $ 3,401 $ 3,869 $ 3,541 $ 4,123 $ 3,465 $ 3,897 $ 14,562 [1] $ 15,026 [1] $ 15,049 [1]
OPERATING EXPENSES:                      
Fuel                 1,666 1,855 2,280
Purchased power                 3,813 4,318 4,716
Other operating expenses 1,023 953 964 918 950 842 900 1,057 3,858 3,749 3,962
Pension and OPEB mark-to-market adjustment 147 0 0 0 242 0 0 0 147 242 835
Provision for depreciation 339 311 334 329 313 328 322 319 1,313 1,282 1,220
General taxes                 1,042 978 962
Impairment of assets 9,218 0 1,447 0 18 8 16 0 10,665 42 0
Total operating expenses                 22,824 12,734 13,987
OPERATING INCOME (LOSS) (8,924) 861 (975) 776 236 908 554 594 (8,262) 2,292 1,062
OTHER INCOME (EXPENSE):                      
Investment income (loss), including net income from equity investees                 84 (22) 72
Interest expense                 (1,157) (1,132) (1,081)
Capitalized financing costs                 103 117 118
Total other expense                 (970) (1,399) (891)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (BENEFITS)                 (9,232) 893 171
INCOME TAXES (BENEFITS) (3,389) 251 (130) 213 (170) 226 115 144 (3,055) 315 (42)
INCOME (LOSS) FROM CONTINUING OPERATIONS                 (6,177) 578 213
Discontinued operations (net of income taxes of $69) (Note 20)                 0 0 86
NET INCOME (LOSS) (5,796) 380 (1,089) 328 (226) 395 187 222 (6,177) 578 299
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)                      
NET INCOME (LOSS) (5,796) 380 (1,089) 328 (226) 395 187 222 (6,177) 578 299
Pension and OPEB prior service costs                 (59) (116) (76)
Amortized gain on derivative hedges                 8 5 (2)
Change in unrealized gain on available-for-sale securities                 55 (11) 26
Other comprehensive income (loss)                 4 (122) (52)
Income taxes (benefits) on other comprehensive income (loss )                 1 (47) (14)
Other comprehensive income (loss), net of tax                 3 (75) (38)
Tax effect of discontinued operations                 0 0 69
Eliminations                      
Consolidating Statements of Income                      
REVENUES                 (3,587) (3,758) (3,920)
OPERATING EXPENSES:                      
Fuel                 0 0 0
Other operating expenses                 49 49 49
Pension and OPEB mark-to-market adjustment                 0 0 0
Provision for depreciation                 (3) (3) (3)
General taxes                 0 0 0
Impairment of assets                 (83) 0  
Total operating expenses                 (3,624) (3,712) (3,874)
OPERATING INCOME (LOSS)                 37 (46) (46)
OTHER INCOME (EXPENSE):                      
Investment income (loss), including net income from equity investees                 4,538 (870) (799)
Miscellaneous income                 0 0 0
Capitalized financing costs                 0 0 0
Total other expense                 4,652 (778) (724)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (BENEFITS)                 4,689 (824) (770)
INCOME TAXES (BENEFITS)                 35 15 6
INCOME (LOSS) FROM CONTINUING OPERATIONS                     (776)
Discontinued operations (net of income taxes of $69) (Note 20)                     0
NET INCOME (LOSS)                 4,654 (839) (776)
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)                      
NET INCOME (LOSS)                 4,654 (839) (776)
Pension and OPEB prior service costs                 14 5 5
Amortized gain on derivative hedges                 0 0 0
Change in unrealized gain on available-for-sale securities                 (52) 8 (21)
Other comprehensive income (loss)                 (38) 13 (16)
Income taxes (benefits) on other comprehensive income (loss )                 (15) 5 (6)
Other comprehensive income (loss), net of tax                 (23) 8 (10)
COMPREHENSIVE INCOME (LOSS)                 4,631 (831) (786)
Eliminations | Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 (3,587) (3,758) (3,920)
OTHER INCOME (EXPENSE):                      
Interest expense                 57 34 15
Eliminations | Non-Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 0 0 0
OTHER INCOME (EXPENSE):                      
Interest expense                 57 58 60
FES                      
Consolidating Statements of Income                      
REVENUES                 4,242 4,824 5,990
OPERATING EXPENSES:                      
Fuel                 0 0 0
Other operating expenses                 310 378 790
Pension and OPEB mark-to-market adjustment                 (1) (8) 19
Provision for depreciation                 13 12 10
General taxes                 31 45 72
Impairment of assets                 39 21  
Total operating expenses                 5,436 5,958 7,578
OPERATING INCOME (LOSS)                 (1,194) (1,134) (1,588)
OTHER INCOME (EXPENSE):                      
Investment income (loss), including net income from equity investees                 (4,585) 844 791
Miscellaneous income                 4 1 2
Capitalized financing costs                 0 0 0
Total other expense                 (4,686) 764 725
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (BENEFITS)                 (5,880) (370) (863)
INCOME TAXES (BENEFITS)                 (425) (452) (619)
INCOME (LOSS) FROM CONTINUING OPERATIONS                     (244)
Discontinued operations (net of income taxes of $69) (Note 20)                     0
NET INCOME (LOSS)                 (5,455) 82 (244)
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)                      
NET INCOME (LOSS)                 (5,455) 82 (244)
Pension and OPEB prior service costs                 (14) (6) (6)
Amortized gain on derivative hedges                 0 (3) (10)
Change in unrealized gain on available-for-sale securities                 52 (9) 21
Other comprehensive income (loss)                 38 (18) 5
Income taxes (benefits) on other comprehensive income (loss )                 15 (7) 2
Other comprehensive income (loss), net of tax                 23 (11) 3
COMPREHENSIVE INCOME (LOSS)                 (5,432) 71 (241)
FES | Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 4,024 3,826 3,920
OTHER INCOME (EXPENSE):                      
Interest expense                 (50) (29) (12)
FES | Non-Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 1,020 1,684 2,767
OTHER INCOME (EXPENSE):                      
Interest expense                 (55) (52) (56)
FG                      
Consolidating Statements of Income                      
REVENUES                 1,739 1,801 1,902
OPERATING EXPENSES:                      
Fuel                 582 679 1,055
Other operating expenses                 286 273 269
Pension and OPEB mark-to-market adjustment                 (4) 10 90
Provision for depreciation                 120 124 119
General taxes                 30 26 31
Impairment of assets                 3,937 2  
Total operating expenses                 4,951 1,114 1,568
OPERATING INCOME (LOSS)                 (3,212) 687 334
OTHER INCOME (EXPENSE):                      
Investment income (loss), including net income from equity investees                 30 17 8
Miscellaneous income                 3 2 4
Capitalized financing costs                 8 6 4
Total other expense                 (74) (87) (92)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (BENEFITS)                 (3,286) 600 242
INCOME TAXES (BENEFITS)                 (1,169) 224 87
INCOME (LOSS) FROM CONTINUING OPERATIONS                     155
Discontinued operations (net of income taxes of $69) (Note 20)                     116
NET INCOME (LOSS)                 (2,117) 376 271
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)                      
NET INCOME (LOSS)                 (2,117) 376 271
Pension and OPEB prior service costs                 (14) (5) (5)
Amortized gain on derivative hedges                 0 0 0
Change in unrealized gain on available-for-sale securities                 0 0 0
Other comprehensive income (loss)                 (14) (5) (5)
Income taxes (benefits) on other comprehensive income (loss )                 (5) (2) (2)
Other comprehensive income (loss), net of tax                 (9) (3) (3)
COMPREHENSIVE INCOME (LOSS)                 (2,126) 373 268
FG | Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 0 0 0
OTHER INCOME (EXPENSE):                      
Interest expense                 (10) (8) (6)
FG | Non-Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 0 0 4
OTHER INCOME (EXPENSE):                      
Interest expense                 (105) (104) (102)
NG                      
Consolidating Statements of Income                      
REVENUES                 2,004 2,138 2,172
OPERATING EXPENSES:                      
Fuel                 198 192 198
Other operating expenses                 632 608 527
Pension and OPEB mark-to-market adjustment                 53 55 188
Provision for depreciation                 206 191 193
General taxes                 27 27 25
Impairment of assets                 4,729 10  
Total operating expenses                 6,032 1,368 1,402
OPERATING INCOME (LOSS)                 (4,028) 770 770
OTHER INCOME (EXPENSE):                      
Investment income (loss), including net income from equity investees                 84 (5) 61
Miscellaneous income                 0 0 0
Capitalized financing costs                 26 29 30
Total other expense                 62 (29) 33
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (BENEFITS)                 (3,966) 741 803
INCOME TAXES (BENEFITS)                 (1,429) 278 298
INCOME (LOSS) FROM CONTINUING OPERATIONS                     505
Discontinued operations (net of income taxes of $69) (Note 20)                     0
NET INCOME (LOSS)                 (2,537) 463 505
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)                      
NET INCOME (LOSS)                 (2,537) 463 505
Pension and OPEB prior service costs                 0 0 0
Amortized gain on derivative hedges                 0 0 0
Change in unrealized gain on available-for-sale securities                 52 (8) 21
Other comprehensive income (loss)                 52 (8) 21
Income taxes (benefits) on other comprehensive income (loss )                 20 (3) 8
Other comprehensive income (loss), net of tax                 32 (5) 13
COMPREHENSIVE INCOME (LOSS)                 (2,505) 458 518
NG | Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 187 285 271
OTHER INCOME (EXPENSE):                      
Interest expense                 (4) (4) (4)
NG | Non-Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 0 0 0
OTHER INCOME (EXPENSE):                      
Interest expense                 (44) (49) (54)
FES                      
Consolidating Statements of Income                      
REVENUES 997 1,100 1,102 1,199 1,171 1,338 1,119 1,377 4,398 [2] 5,005 [2] 6,144 [2]
OPERATING EXPENSES:                      
Fuel                 780 871 1,253
Other operating expenses 352 316 369 240 312 246 337 413 1,277 1,308 1,635
Pension and OPEB mark-to-market adjustment 48 0 0 0 57 0 0 0 48 57 297
Provision for depreciation 86 83 84 83 84 79 81 80 336 324 319
General taxes                 88 98 128
Impairment of assets 8,082 0 540 0 17 0 16 0 8,622 33 0
Total operating expenses                 12,795 4,728 6,674
OPERATING INCOME (LOSS) (8,153) 101 (571) 226 25 240 0 12 (8,397) 277 (530)
OTHER INCOME (EXPENSE):                      
Investment income (loss), including net income from equity investees                 67 (14) 61
Miscellaneous income                 7 3 6
Capitalized financing costs                 34 35 34
Total other expense                 (46) (130) (58)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (BENEFITS)                 (8,443) 147 (588)
INCOME TAXES (BENEFITS) (2,983) 56 (143) 82 1 70 (4) (2) (2,988) 65 (228)
INCOME (LOSS) FROM CONTINUING OPERATIONS                 (5,455) 82 (360)
Discontinued operations (net of income taxes of $69) (Note 20)                 0 0 116
NET INCOME (LOSS) (5,188) 40 (438) 131 (14) 120 (21) (3) (5,455) 82 (244)
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)                      
NET INCOME (LOSS) $ (5,188) $ 40 $ (438) $ 131 $ (14) $ 120 $ (21) $ (3) (5,455) 82 (244)
Pension and OPEB prior service costs                 (14) (6) (6)
Amortized gain on derivative hedges                 0 (3) (10)
Change in unrealized gain on available-for-sale securities                 52 (9) 21
Other comprehensive income (loss)                 38 (18) 5
Income taxes (benefits) on other comprehensive income (loss )                 15 (7) 2
Other comprehensive income (loss), net of tax                 23 (11) 3
COMPREHENSIVE INCOME (LOSS)                 (5,432) 71 (241)
Tax effect of discontinued operations                 0 0 70
FES | Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 624 353 271
OTHER INCOME (EXPENSE):                      
Interest expense                 (7) (7) (7)
FES | Non-Affiliates                      
OPERATING EXPENSES:                      
Purchased power                 1,020 1,684 2,771
OTHER INCOME (EXPENSE):                      
Interest expense                 $ (147) $ (147) $ (152)
[1] Includes excise tax collections of $406 million, $416 million and $420 million in 2016, 2015 and 2014, respectively.
[2] Includes excise tax collections of $28 million, $44 million and $69 million in 2016, 2015 and 2014, respectively.