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Supplemental Guarantor Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Consolidating Statements of Income        
Revenues [1] $ 3,401 $ 3,465 $ 7,270 $ 7,362
OPERATING EXPENSES:        
Fuel 438 383 819 896
Purchased power 889 989 2,013 2,102
Other operating expenses 964 900 1,882 1,957
Provision for depreciation 334 322 663 641
General taxes 241 242 521 511
Impairment of assets 1,447 16 1,447 16
Total operating expenses 4,376 2,911 7,469 6,214
OPERATING INCOME (LOSS) (975) 554 (199) 1,148
OTHER INCOME (EXPENSE):        
Investment income, including net income from equity investees 19 (3) 47 14
Interest expense (289) (282) (577) (561)
Capitalized interest 26 33 51 67
Total other expense (244) (252) (479) (480)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) (1,219) 302 (678) 668
INCOME TAXES (BENEFITS) (130) 115 83 259
NET INCOME (LOSS) (1,089) 187 (761) 409
OTHER COMPREHENSIVE INCOME (LOSS):        
NET INCOME (LOSS) (1,089) 187 (761) 409
Pension and OPEB prior service costs (18) (32) (36) (63)
Amortized gains on derivative hedges 2 1 4 2
Change in unrealized gains on available-for-sale securities 35 (14) 63 (10)
Other comprehensive income (loss) 19 (45) 31 (71)
Income taxes (benefits) on other comprehensive income (loss) 7 (17) 11 (27)
Other comprehensive income (loss), net of tax 12 (28) 20 (44)
COMPREHENSIVE INCOME (LOSS) $ (1,077) 159 $ (741) 365
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 $ (832) (757) $ (1,734) (1,712)
OPERATING EXPENSES:        
Fuel 0 0 0 0
Other operating expenses 14 12 26 24
Provision for depreciation (1) 0 (2) (1)
General taxes 0 0 0 0
Impairment of assets 0 0 0 0
Total operating expenses (819) (745) (1,710) (1,689)
OPERATING INCOME (LOSS) (13) (12) (24) (23)
OTHER INCOME (EXPENSE):        
Investment income, including net income from equity investees 153 (126) (106) (371)
Miscellaneous income 0 0 0 0
Capitalized interest 0 0 0 0
Total other expense 181 (104) (53) (327)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) 168 (116) (77) (350)
INCOME TAXES (BENEFITS) 1 1 2 3
NET INCOME (LOSS) 167 (117) (79) (353)
OTHER COMPREHENSIVE INCOME (LOSS):        
NET INCOME (LOSS) 167 (117) (79) (353)
Pension and OPEB prior service costs 4 4 7 8
Amortized gains on derivative hedges 0 0 0 0
Change in unrealized gains on available-for-sale securities (32) 12 (55) 9
Other comprehensive income (loss) (28) 16 (48) 17
Income taxes (benefits) on other comprehensive income (loss) (11) 6 (18) 6
Other comprehensive income (loss), net of tax (17) 10 (30) 11
COMPREHENSIVE INCOME (LOSS) 150 (107) (109) (342)
Eliminations | Affiliates        
OPERATING EXPENSES:        
Purchased power (832) (757) (1,734) (1,712)
OTHER INCOME (EXPENSE):        
Interest expense 13 8 24 15
Eliminations | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense 15 14 29 29
FES        
Consolidating Statements of Income        
Revenues 1,061 1,074 2,216 2,406
OPERATING EXPENSES:        
Fuel 0 0 0 0
Other operating expenses 119 86 123 266
Provision for depreciation 3 2 6 5
General taxes 7 11 15 26
Impairment of assets 23 16 23 16
Total operating expenses 1,368 1,275 2,687 2,973
OPERATING INCOME (LOSS) (307) (201) (471) (567)
OTHER INCOME (EXPENSE):        
Investment income, including net income from equity investees (163) 119 86 360
Miscellaneous income 1 1 3 1
Capitalized interest 0 0 0 0
Total other expense (187) 100 42 322
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) (494) (101) (429) (245)
INCOME TAXES (BENEFITS) (56) (80) (122) (221)
NET INCOME (LOSS) (438) (21) (307) (24)
OTHER COMPREHENSIVE INCOME (LOSS):        
NET INCOME (LOSS) (438) (21) (307) (24)
Pension and OPEB prior service costs (3) (4) (7) (8)
Amortized gains on derivative hedges (1) (1) (1) (2)
Change in unrealized gains on available-for-sale securities 33 (12) 56 (9)
Other comprehensive income (loss) 29 (17) 48 (19)
Income taxes (benefits) on other comprehensive income (loss) 12 (6) 19 (7)
Other comprehensive income (loss), net of tax 17 (11) 29 (12)
COMPREHENSIVE INCOME (LOSS) (421) (32) (278) (36)
FES | Affiliates        
OPERATING EXPENSES:        
Purchased power 950 768 1,877 1,725
OTHER INCOME (EXPENSE):        
Interest expense (12) (7) (21) (13)
FES | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 266 392 643 935
OTHER INCOME (EXPENSE):        
Interest expense (13) (13) (26) (26)
FGCO        
Consolidating Statements of Income        
Revenues 400 346 815 839
OPERATING EXPENSES:        
Fuel 181 150 300 330
Other operating expenses 88 75 159 142
Provision for depreciation 32 32 63 62
General taxes 6 7 16 15
Impairment of assets 517 0 517 0
Total operating expenses 824 264 1,055 549
OPERATING INCOME (LOSS) (424) 82 (240) 290
OTHER INCOME (EXPENSE):        
Investment income, including net income from equity investees 7 5 13 8
Miscellaneous income 0 3 0 3
Capitalized interest 2 2 4 3
Total other expense (19) (18) (39) (42)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) (443) 64 (279) 248
INCOME TAXES (BENEFITS) (149) 28 (88) 95
NET INCOME (LOSS) (294) 36 (191) 153
OTHER COMPREHENSIVE INCOME (LOSS):        
NET INCOME (LOSS) (294) 36 (191) 153
Pension and OPEB prior service costs (4) (4) (7) (8)
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) (4) (4) (7) (8)
Income taxes (benefits) on other comprehensive income (loss) (2) (2) (3) (3)
Other comprehensive income (loss), net of tax (2) (2) (4) (5)
COMPREHENSIVE INCOME (LOSS) (296) 34 (195) 148
FGCO | Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (2) (2) (4) (4)
FGCO | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (26) (26) (52) (52)
Nuclear Generation Corp        
Consolidating Statements of Income        
Revenues 473 456 1,004 963
OPERATING EXPENSES:        
Fuel 47 41 93 91
Other operating expenses 148 164 301 318
Provision for depreciation 50 47 100 95
General taxes 6 7 14 13
Impairment of assets 0 0 0 0
Total operating expenses 300 325 614 651
OPERATING INCOME (LOSS) 173 131 390 312
OTHER INCOME (EXPENSE):        
Investment income, including net income from equity investees 22 3 39 17
Miscellaneous income 0 0 0 0
Capitalized interest 6 7 14 15
Total other expense 15 (3) 27 5
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) 188 128 417 317
INCOME TAXES (BENEFITS) 61 47 147 117
NET INCOME (LOSS) 127 81 270 200
OTHER COMPREHENSIVE INCOME (LOSS):        
NET INCOME (LOSS) 127 81 270 200
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 32 (12) 55 (9)
Other comprehensive income (loss) 32 (12) 55 (9)
Income taxes (benefits) on other comprehensive income (loss) 13 (4) 21 (3)
Other comprehensive income (loss), net of tax 19 (8) 34 (6)
COMPREHENSIVE INCOME (LOSS) 146 73 304 194
Nuclear Generation Corp | Affiliates        
OPERATING EXPENSES:        
Purchased power 49 66 106 134
OTHER INCOME (EXPENSE):        
Interest expense 0 (1) (2) (2)
Nuclear Generation Corp | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 0 0 0 0
OTHER INCOME (EXPENSE):        
Interest expense (13) (12) (24) (25)
FES        
Consolidating Statements of Income        
Revenues 1,102 1,119 2,301 2,496
OPERATING EXPENSES:        
Fuel 228 191 393 421
Other operating expenses 369 337 609 750
Provision for depreciation 84 81 167 161
General taxes 19 25 45 54
Impairment of assets 540 16 540 16
Total operating expenses 1,673 1,119 2,646 2,484
OPERATING INCOME (LOSS) (571) 0 (345) 12
OTHER INCOME (EXPENSE):        
Investment income, including net income from equity investees 19 1 32 14
Miscellaneous income 1 4 3 4
Capitalized interest 8 9 18 18
Total other expense (10) (25) (23) (42)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) (581) (25) (368) (30)
INCOME TAXES (BENEFITS) (143) (4) (61) (6)
NET INCOME (LOSS) (438) (21) (307) (24)
OTHER COMPREHENSIVE INCOME (LOSS):        
NET INCOME (LOSS) (438) (21) (307) (24)
Pension and OPEB prior service costs (3) (4) (7) (8)
Amortized gains on derivative hedges (1) (1) (1) (2)
Change in unrealized gains on available-for-sale securities 33 (12) 56 (9)
Other comprehensive income (loss) 29 (17) 48 (19)
Income taxes (benefits) on other comprehensive income (loss) 12 (6) 19 (7)
Other comprehensive income (loss), net of tax 17 (11) 29 (12)
COMPREHENSIVE INCOME (LOSS) (421) (32) (278) (36)
FES | Affiliates        
OPERATING EXPENSES:        
Purchased power 167 77 249 147
OTHER INCOME (EXPENSE):        
Interest expense (1) (2) (3) (4)
FES | Non-Affiliates        
OPERATING EXPENSES:        
Purchased power 266 392 643 935
OTHER INCOME (EXPENSE):        
Interest expense $ (37) $ (37) $ (73) $ (74)
[1] Includes excise tax collections of $92 million and $96 million in the three months ended June 30, 2016 and 2015, respectively, and $199 million and $211 million in the six months ended June 30, 2016 and 2015, respectively.