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Supplemental Guarantor Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Consolidating Statements of Income        
Revenues [1] $ 3,917 $ 4,123 $ 11,187 $ 11,485
OPERATING EXPENSES:        
Fuel 450 482 1,269 1,378
Purchased power 979 1,209 2,992 3,311
Other operating expenses 953 842 2,835 2,799
Provision for depreciation 311 328 974 969
General taxes 265 236 786 747
Impairment of assets 0 8 1,447 24
Total operating expenses 3,056 3,215 10,525 9,429
OPERATING INCOME 861 908 662 2,056
OTHER INCOME (EXPENSE):        
Investment income, including net income (loss) from equity investees 28 (28) 75 (14)
Interest expense (286) (285) (863) (846)
Capitalized financing costs 28 26 79 93
Total other expense (230) (287) (709) (767)
INCOME (LOSS) BEFORE INCOME TAXES 631 621 (47) 1,289
INCOME TAXES (BENEFITS) 251 226 334 485
NET INCOME (LOSS) 380 395 (381) 804
NET INCOME (LOSS) 380 395 (381) 804
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (18) (31) (54) (94)
Amortized losses (gains) on derivative hedges 2 2 6 4
Change in unrealized gains on available-for-sale securities 4 (11) 67 (21)
Other comprehensive income (loss) (12) (40) 19 (111)
Income taxes (benefits) on other comprehensive income (loss) (5) (15) 6 (42)
Other comprehensive income (loss), net of tax (7) (25) 13 (69)
COMPREHENSIVE INCOME (LOSS) $ 373 370 $ (368) 735
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 $ (859) (906) $ (2,593) (2,618)
OPERATING EXPENSES:        
Fuel 0 0 0 0
Other operating expenses 11 12 37 36
Provision for depreciation 0 (1) (2) (2)
General taxes 0 0 0 0
Impairment of assets     0 0
Total operating expenses (848) (895) (2,558) (2,584)
OPERATING INCOME (11) (11) (35) (34)
OTHER INCOME (EXPENSE):        
Investment income, including net income (loss) from equity investees (236) (198) (342) (569)
Miscellaneous income 0 0 0 0
Capitalized financing costs 0 0 0 0
Total other expense (207) (174) (260) (501)
INCOME (LOSS) BEFORE INCOME TAXES (218) (185) (295) (535)
INCOME TAXES (BENEFITS) 2 1 4 4
NET INCOME (LOSS) (220) (186) (299) (539)
NET INCOME (LOSS) (220) (186) (299) (539)
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs 3 3 10 11
Amortized losses (gains) on derivative hedges 0 0 0 0
Change in unrealized gains on available-for-sale securities (5) 11 (60) 20
Other comprehensive income (loss) (2) 14 (50) 31
Income taxes (benefits) on other comprehensive income (loss) (1) 5 (19) 11
Other comprehensive income (loss), net of tax (1) 9 (31) 20
COMPREHENSIVE INCOME (LOSS) (221) (177) (330) (519)
Eliminations | Affiliates        
OPERATING EXPENSES:        
Purchased power (859) (906) (2,593) (2,618)
OTHER INCOME (EXPENSE):        
Interest expense 15 9 39 24
Eliminations | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense 14 15 43 44
FES        
Consolidating Statements of Income        
Revenues 1,065 1,293 3,281 3,699
OPERATING EXPENSES:        
Fuel 0 0 0 0
Other operating expenses 95 34 218 300
Provision for depreciation 4 3 10 8
General taxes 8 10 23 36
Impairment of assets     23 16
Total operating expenses 1,304 1,380 3,991 4,353
OPERATING INCOME (239) (87) (710) (654)
OTHER INCOME (EXPENSE):        
Investment income, including net income (loss) from equity investees 224 191 310 551
Miscellaneous income 0 0 3 1
Capitalized financing costs 0 0 0 0
Total other expense 197 170 239 492
INCOME (LOSS) BEFORE INCOME TAXES (42) 83 (471) (162)
INCOME TAXES (BENEFITS) (82) (37) (204) (258)
NET INCOME (LOSS) 40 120 (267) 96
NET INCOME (LOSS) 40 120 (267) 96
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (3) (4) (10) (12)
Amortized losses (gains) on derivative hedges 1 0 0 (2)
Change in unrealized gains on available-for-sale securities 5 (11) 61 (20)
Other comprehensive income (loss) 3 (15) 51 (34)
Income taxes (benefits) on other comprehensive income (loss) 1 (6) 20 (13)
Other comprehensive income (loss), net of tax 2 (9) 31 (21)
COMPREHENSIVE INCOME (LOSS) 42 111 (236) 75
FES | Affiliates        
OPERATING EXPENSES:        
Purchased power 1,011 932 2,888 2,657
OTHER INCOME (EXPENSE):        
Interest expense (13) (8) (34) (21)
FES | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 186 401 829 1,336
OTHER INCOME (EXPENSE):        
Interest expense (14) (13) (40) (39)
FG        
Consolidating Statements of Income        
Revenues 494 420 1,309 1,259
OPERATING EXPENSES:        
Fuel 149 193 449 523
Other operating expenses 61 66 220 208
Provision for depreciation 28 30 91 92
General taxes 7 8 23 23
Impairment of assets     517 0
Total operating expenses 245 297 1,300 846
OPERATING INCOME 249 123 9 413
OTHER INCOME (EXPENSE):        
Investment income, including net income (loss) from equity investees 8 4 21 12
Miscellaneous income 1 1 1 4
Capitalized financing costs 3 1 7 4
Total other expense (18) (22) (57) (64)
INCOME (LOSS) BEFORE INCOME TAXES 231 101 (48) 349
INCOME TAXES (BENEFITS) 87 36 (1) 131
NET INCOME (LOSS) 144 65 (47) 218
NET INCOME (LOSS) 144 65 (47) 218
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (3) (3) (10) (11)
Amortized losses (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) (11)
Income taxes (benefits) on other comprehensive income (loss) (1) (1) (4) (4)
Other comprehensive income (loss), net of tax (2) (2) (6) (7)
COMPREHENSIVE INCOME (LOSS) 142 63 (53) 211
FG | Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (3) (2) (7) (6)
FG | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (27) (26) (79) (78)
NG        
Consolidating Statements of Income        
Revenues 400 531 1,404 1,494
OPERATING EXPENSES:        
Fuel 53 52 146 143
Other operating expenses 149 134 450 452
Provision for depreciation 51 47 151 142
General taxes 6 6 20 19
Impairment of assets     0 0
Total operating expenses 298 316 912 967
OPERATING INCOME 102 215 492 527
OTHER INCOME (EXPENSE):        
Investment income, including net income (loss) from equity investees 28 (18) 67 (1)
Miscellaneous income 0 0 0 0
Capitalized financing costs 6 7 20 22
Total other expense 23 (24) 50 (19)
INCOME (LOSS) BEFORE INCOME TAXES 125 191 542 508
INCOME TAXES (BENEFITS) 49 70 196 187
NET INCOME (LOSS) 76 121 346 321
NET INCOME (LOSS) 76 121 346 321
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs 0 0 0 0
Amortized losses (gains) on derivative hedges 0 0 0 0
Change in unrealized gains on available-for-sale securities 5 (11) 60 (20)
Other comprehensive income (loss) 5 (11) 60 (20)
Income taxes (benefits) on other comprehensive income (loss) 2 (4) 23 (7)
Other comprehensive income (loss), net of tax 3 (7) 37 (13)
COMPREHENSIVE INCOME (LOSS) 79 114 383 308
NG | Affiliates        
OPERATING EXPENSES:        
Purchased power 39 77 145 211
OTHER INCOME (EXPENSE):        
Interest expense (2) (1) (4) (3)
NG | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (9) (12) (33) (37)
Consolidated        
Consolidating Statements of Income        
Revenues 1,100 1,338 3,401 3,834
OPERATING EXPENSES:        
Fuel 202 245 595 666
Other operating expenses 316 246 925 996
Provision for depreciation 83 79 250 240
General taxes 21 24 66 78
Impairment of assets 0 0 540 16
Total operating expenses 999 1,098 3,645 3,582
OPERATING INCOME 101 240 (244) 252
OTHER INCOME (EXPENSE):        
Investment income, including net income (loss) from equity investees 24 (21) 56 (7)
Miscellaneous income 1 1 4 5
Capitalized financing costs 9 8 27 26
Total other expense (5) (50) (28) (92)
INCOME (LOSS) BEFORE INCOME TAXES 96 190 (272) 160
INCOME TAXES (BENEFITS) 56 70 (5) 64
NET INCOME (LOSS) 40 120 (267) 96
NET INCOME (LOSS) 40 120 (267) 96
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (3) (4) (10) (12)
Amortized losses (gains) on derivative hedges 1 0 0 (2)
Change in unrealized gains on available-for-sale securities 5 (11) 61 (20)
Other comprehensive income (loss) 3 (15) 51 (34)
Income taxes (benefits) on other comprehensive income (loss) 1 (6) 20 (13)
Other comprehensive income (loss), net of tax 2 (9) 31 (21)
COMPREHENSIVE INCOME (LOSS) 42 111 (236) 75
Consolidated | Affiliates        
OPERATING EXPENSES:        
Purchased power 191 103 440 250
OTHER INCOME (EXPENSE):        
Interest expense (3) (2) (6) (6)
Consolidated | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 186 401 829 1,336
OTHER INCOME (EXPENSE):        
Interest expense $ (36) $ (36) $ (109) $ (110)
[1] Includes excise tax collections of $111 million and $109 million in the three months ended September 30, 2016 and 2015, respectively, and $310 million and $320 million in the nine months ended September 30, 2016 and 2015, respectively.