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Supplemental Guarantor Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Consolidating Statements of Income    
Revenues [1] $ 3,552 $ 3,869
OPERATING EXPENSES:    
Fuel 368 381
Purchased power 863 1,124
Other operating expenses 1,142 918
Provision for depreciation 275 329
General taxes 271 280
Total operating expenses 2,978 3,093
OPERATING INCOME 574 776
OTHER INCOME (EXPENSE):    
Investment income (loss), including net income (loss) from equity investees 24 28
Interest expense (287) (288)
Capitalized interest 20 25
Total other expense (243) (235)
INCOME BEFORE INCOME TAXES 331 541
INCOME TAXES (BENEFITS) 126 213
NET INCOME 205 328
NET INCOME 205 328
OTHER COMPREHENSIVE INCOME (LOSS):    
Pension and OPEB prior service costs (18) (18)
Change in unrealized gains on available-for-sale securities 16 28
Other comprehensive income 1 12
Income taxes (benefits) on other comprehensive income (loss) 0 4
Other comprehensive income, net of tax 1 8
COMPREHENSIVE INCOME $ 206 336
Bruce Mansfield Unit 1    
Condensed Financial Statements, Captions [Line Items]    
Percentage of undivided interest of non guarantor subsidiary 93.83%  
Eliminations    
Consolidating Statements of Income    
Revenues $ (538) (902)
OPERATING EXPENSES:    
Fuel 0 0
Other operating expenses 12 12
Provision for depreciation 0 (1)
General taxes 0 0
Total operating expenses (526) (891)
OPERATING INCOME (12) (11)
OTHER INCOME (EXPENSE):    
Investment income (loss), including net income (loss) from equity investees 1 (259)
Miscellaneous income 0 0
Capitalized interest 0 0
Total other expense 35 (234)
INCOME BEFORE INCOME TAXES 23 (245)
INCOME TAXES (BENEFITS) 1 1
NET INCOME 22 (246)
NET INCOME 22 (246)
OTHER COMPREHENSIVE INCOME (LOSS):    
Pension and OPEB prior service costs 3 3
Change in unrealized gains on available-for-sale securities (16) (23)
Other comprehensive income (13) (20)
Income taxes (benefits) on other comprehensive income (loss) (5) (7)
Other comprehensive income, net of tax (8) (13)
COMPREHENSIVE INCOME 14 (259)
Eliminations | Affiliates    
OPERATING EXPENSES:    
Purchased power (538) (902)
OTHER INCOME (EXPENSE):    
Interest expense 20 11
Eliminations | Non-Affiliates    
OPERATING EXPENSES:    
Purchased power 0 0
OTHER INCOME (EXPENSE):    
Interest expense 14 14
FES    
Consolidating Statements of Income    
Revenues 880 1,155
OPERATING EXPENSES:    
Fuel 0 0
Other operating expenses 114 4
Provision for depreciation 3 3
General taxes 6 8
Total operating expenses 946 1,319
OPERATING INCOME (66) (164)
OTHER INCOME (EXPENSE):    
Investment income (loss), including net income (loss) from equity investees (18) 249
Miscellaneous income 0 2
Capitalized interest 0 0
Total other expense (47) 229
INCOME BEFORE INCOME TAXES (113) 65
INCOME TAXES (BENEFITS) (33) (66)
NET INCOME (80) 131
NET INCOME (80) 131
OTHER COMPREHENSIVE INCOME (LOSS):    
Pension and OPEB prior service costs (3) (4)
Change in unrealized gains on available-for-sale securities 16 23
Other comprehensive income 13 19
Income taxes (benefits) on other comprehensive income (loss) 5 7
Other comprehensive income, net of tax 8 12
COMPREHENSIVE INCOME (72) 143
FES | Affiliates    
OPERATING EXPENSES:    
Purchased power 663 927
OTHER INCOME (EXPENSE):    
Interest expense (18) (9)
FES | Non-Affiliates    
OPERATING EXPENSES:    
Purchased power 160 377
OTHER INCOME (EXPENSE):    
Interest expense (11) (13)
FG    
Consolidating Statements of Income    
Revenues 236 415
OPERATING EXPENSES:    
Fuel 98 119
Other operating expenses 225 71
Provision for depreciation 7 31
General taxes 8 10
Total operating expenses 338 231
OPERATING INCOME (102) 184
OTHER INCOME (EXPENSE):    
Investment income (loss), including net income (loss) from equity investees 10 6
Miscellaneous income 0 0
Capitalized interest 1 2
Total other expense (19) (20)
INCOME BEFORE INCOME TAXES (121) 164
INCOME TAXES (BENEFITS) (42) 61
NET INCOME (79) 103
NET INCOME (79) 103
OTHER COMPREHENSIVE INCOME (LOSS):    
Pension and OPEB prior service costs (3) (3)
Change in unrealized gains on available-for-sale securities 0 0
Other comprehensive income (3) (3)
Income taxes (benefits) on other comprehensive income (loss) (1) (1)
Other comprehensive income, net of tax (2) (2)
COMPREHENSIVE INCOME (81) 101
FG | Affiliates    
OPERATING EXPENSES:    
Purchased power 0 0
OTHER INCOME (EXPENSE):    
Interest expense (3) (2)
FG | Non-Affiliates    
OPERATING EXPENSES:    
Purchased power 0 0
OTHER INCOME (EXPENSE):    
Interest expense (27) (26)
NG    
Consolidating Statements of Income    
Revenues 336 531
OPERATING EXPENSES:    
Fuel 46 46
Other operating expenses 167 153
Provision for depreciation 15 50
General taxes 7 8
Total operating expenses 273 314
OPERATING INCOME 63 217
OTHER INCOME (EXPENSE):    
Investment income (loss), including net income (loss) from equity investees 27 17
Miscellaneous income 5 0
Capitalized interest 7 8
Total other expense 27 12
INCOME BEFORE INCOME TAXES 90 229
INCOME TAXES (BENEFITS) 33 86
NET INCOME 57 143
NET INCOME 57 143
OTHER COMPREHENSIVE INCOME (LOSS):    
Pension and OPEB prior service costs 0 0
Change in unrealized gains on available-for-sale securities 16 23
Other comprehensive income 16 23
Income taxes (benefits) on other comprehensive income (loss) 6 8
Other comprehensive income, net of tax 10 15
COMPREHENSIVE INCOME 67 158
NG | Affiliates    
OPERATING EXPENSES:    
Purchased power 38 57
OTHER INCOME (EXPENSE):    
Interest expense (1) (2)
NG | Non-Affiliates    
OPERATING EXPENSES:    
Purchased power 0 0
OTHER INCOME (EXPENSE):    
Interest expense (11) (11)
Consolidated    
Consolidating Statements of Income    
Revenues 914 1,199
OPERATING EXPENSES:    
Fuel 144 165
Other operating expenses 518 240
Provision for depreciation 25 83
General taxes 21 26
Total operating expenses 1,031 973
OPERATING INCOME (117) 226
OTHER INCOME (EXPENSE):    
Investment income (loss), including net income (loss) from equity investees 20 13
Miscellaneous income 5 2
Capitalized interest 8 10
Total other expense (4) (13)
INCOME BEFORE INCOME TAXES (121) 213
INCOME TAXES (BENEFITS) (41) 82
NET INCOME (80) 131
NET INCOME (80) 131
OTHER COMPREHENSIVE INCOME (LOSS):    
Pension and OPEB prior service costs (3) (4)
Change in unrealized gains on available-for-sale securities 16 23
Other comprehensive income 13 19
Income taxes (benefits) on other comprehensive income (loss) 5 7
Other comprehensive income, net of tax 8 12
COMPREHENSIVE INCOME (72) 143
Consolidated | Affiliates    
OPERATING EXPENSES:    
Purchased power 163 82
OTHER INCOME (EXPENSE):    
Interest expense (2) (2)
Consolidated | Non-Affiliates    
OPERATING EXPENSES:    
Purchased power 160 377
OTHER INCOME (EXPENSE):    
Interest expense $ (35) $ (36)
[1] Includes excise tax collections of $100 million and $107 million in the three months ended March 31, 2017 and 2016, respectively.