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Supplemental Guarantor Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Consolidating Statements of Income        
Revenues [1] $ 3,714 $ 3,917 $ 10,575 $ 11,187
OPERATING EXPENSES:        
Fuel 363 450 1,074 1,269
Purchased power 861 979 2,459 2,992
Other operating expenses 942 953 3,041 2,835
Provision for depreciation 289 311 845 974
General taxes 253 265 777 786
Impairment of assets 31 0 162 1,447
Total operating expenses 2,830 3,056 8,573 10,525
OPERATING INCOME 884 861 2,002 662
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 37 28 78 75
Interest expense (305) (286) (882) (863)
Capitalized interest 19 28 59 79
Total other expense (249) (230) (745) (709)
INCOME (LOSS) BEFORE INCOME TAXES 635 631 1,257 (47)
INCOME TAXES (BENEFITS) 239 251 482 334
NET INCOME (LOSS) 396 380 775 (381)
NET INCOME 396 380 775 (381)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (19) (18) (55) (54)
Amortized gains on derivative hedges 4 2 8 6
Change in unrealized gains on available-for-sale securities (6) 4 8 67
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
COMPREHENSIVE INCOME (LOSS) $ 384 373 $ 752 (368)
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 $ (521) (859) $ (1,869) (2,593)
OPERATING EXPENSES:        
Fuel 0 0 0 0
Other operating expenses 12 11 36 37
Provision for depreciation (1) 0 (2) (2)
General taxes 0 0 0 0
Impairment of assets       0
Total operating expenses (510) (848) (1,835) (2,558)
OPERATING INCOME (11) (11) (34) (35)
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees (121) (236) (383) (342)
Miscellaneous income 0 0 0 0
Capitalized interest 0 0 0 0
Total other expense (91) (207) (286) (260)
INCOME (LOSS) BEFORE INCOME TAXES (102) (218) (320) (295)
INCOME TAXES (BENEFITS) 1 2 3 4
NET INCOME (LOSS) (103) (220) (323) (299)
NET INCOME (103) (220) (323) (299)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs 3 3 10 10
Amortized gains on derivative hedges 0 0 0 0
Change in unrealized gains on available-for-sale securities 6 (5) (16) (60)
Other comprehensive income (loss) 9 (2) (6) (50)
Income taxes (benefits) on other comprehensive income (loss) 3 (1) (2) (19)
Other comprehensive income (loss), net of tax 6 (1) (4) (31)
COMPREHENSIVE INCOME (LOSS) (97) (221) (327) (330)
Eliminations | Affiliates        
OPERATING EXPENSES:        
Purchased power (521) (859) (1,869) (2,593)
OTHER INCOME (EXPENSE):        
Interest expense 16 15 55 39
Eliminations | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense 14 14 42 43
FES        
Consolidating Statements of Income        
Revenues 741 1,065 2,338 3,281
OPERATING EXPENSES:        
Fuel 0 0 0 0
Other operating expenses 70 95 247 218
Provision for depreciation 3 4 9 10
General taxes 4 8 15 23
Impairment of assets       23
Total operating expenses 749 1,304 2,733 3,991
OPERATING INCOME (8) (239) (395) (710)
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 106 224 335 310
Miscellaneous income 1 0 1 3
Capitalized interest 0 0 0 0
Total other expense 75 197 243 239
INCOME (LOSS) BEFORE INCOME TAXES 67 (42) (152) (471)
INCOME TAXES (BENEFITS) (9) (82) (167) (204)
NET INCOME (LOSS) 76 40 15 (267)
NET INCOME 76 40 15 (267)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (3) (3) (10) (10)
Amortized gains on derivative hedges 1 1 1 0
Change in unrealized gains on available-for-sale securities (6) 5 16 61
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
COMPREHENSIVE INCOME (LOSS) 71 42 20 (236)
FES | Affiliates        
OPERATING EXPENSES:        
Purchased power 520 1,011 1,994 2,888
OTHER INCOME (EXPENSE):        
Interest expense (20) (13) (58) (34)
FES | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 152 186 468 829
OTHER INCOME (EXPENSE):        
Interest expense (12) (14) (35) (40)
FG        
Consolidating Statements of Income        
Revenues 231 494 941 1,309
OPERATING EXPENSES:        
Fuel 108 149 312 449
Other operating expenses 62 61 345 220
Provision for depreciation 8 28 24 91
General taxes 3 7 16 23
Impairment of assets       517
Total operating expenses 181 245 697 1,300
OPERATING INCOME 50 249 244 9
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 11 8 31 21
Miscellaneous income 0 1 0 1
Capitalized interest 0 3 1 7
Total other expense (17) (18) (55) (57)
INCOME (LOSS) BEFORE INCOME TAXES 33 231 189 (48)
INCOME TAXES (BENEFITS) 6 87 66 (1)
NET INCOME (LOSS) 27 144 123 (47)
NET INCOME 27 144 123 (47)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (3) (3) (10) (10)
Amortized gains on derivative hedges 0 0 0 0
Change in unrealized gains on available-for-sale securities 0 0 0 0
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)
COMPREHENSIVE INCOME (LOSS) 25 142 117 (53)
FG | Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (3) (3) (9) (7)
FG | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (25) (27) (78) (79)
NG        
Consolidating Statements of Income        
Revenues 292 400 988 1,404
OPERATING EXPENSES:        
Fuel 57 53 151 146
Other operating expenses 147 149 467 450
Provision for depreciation 18 51 49 151
General taxes (2) 6 13 20
Impairment of assets       0
Total operating expenses 221 298 757 912
OPERATING INCOME 71 102 231 492
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 43 28 91 67
Miscellaneous income 0 0 5 0
Capitalized interest 6 6 19 20
Total other expense 39 23 81 50
INCOME (LOSS) BEFORE INCOME TAXES 110 125 312 542
INCOME TAXES (BENEFITS) 34 49 112 196
NET INCOME (LOSS) 76 76 200 346
NET INCOME 76 76 200 346
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs 0 0 0 0
Amortized gains on derivative hedges 0 0 0 0
Change in unrealized gains on available-for-sale securities (6) 5 16 60
Other comprehensive income (loss) (6) 5 16 60
Income taxes (benefits) on other comprehensive income (loss) (2) 2 6 23
Other comprehensive income (loss), net of tax (4) 3 10 37
COMPREHENSIVE INCOME (LOSS) 72 79 210 383
NG | Affiliates        
OPERATING EXPENSES:        
Purchased power 1 39 77 145
OTHER INCOME (EXPENSE):        
Interest expense 1 (2) (1) (4)
NG | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (11) (9) (33) (33)
Consolidated        
Consolidating Statements of Income        
Revenues 743 1,100 2,398 3,401
OPERATING EXPENSES:        
Fuel 165 202 463 595
Other operating expenses 291 316 1,095 925
Provision for depreciation 28 83 80 250
General taxes 5 21 44 66
Impairment of assets 0 0 0 540
Total operating expenses 641 999 2,352 3,645
OPERATING INCOME 102 101 46 (244)
OTHER INCOME (EXPENSE):        
Investment income (loss), including net income (loss) from equity investees 39 24 74 56
Miscellaneous income 1 1 6 4
Capitalized interest 6 9 20 27
Total other expense 6 (5) (17) (28)
INCOME (LOSS) BEFORE INCOME TAXES 108 96 29 (272)
INCOME TAXES (BENEFITS) 32 56 14 (5)
NET INCOME (LOSS) 76 40 15 (267)
NET INCOME 76 40 15 (267)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (3) (3) (10) (10)
Amortized gains on derivative hedges 1 1 1 0
Change in unrealized gains on available-for-sale securities (6) 5 16 61
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
COMPREHENSIVE INCOME (LOSS) 71 42 20 (236)
Consolidated | Affiliates        
OPERATING EXPENSES:        
Purchased power 0 191 202 440
OTHER INCOME (EXPENSE):        
Interest expense (6) (3) (13) (6)
Consolidated | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 152 186 468 829
OTHER INCOME (EXPENSE):        
Interest expense $ (34) $ (36) $ (104) $ (109)
[1] Includes excise tax collections of $102 million and $111 million in the three months ended September 30, 2017 and 2016, respectively, and $293 million and $310 million in the nine months ended September 30, 2017 and 2016, respectively.