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Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (FirstEnergy Solutions Corp.) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
REVENUES:      
Electric sales $ 2,958 $ 3,789 $ 4,398
Total revenues [1] 14,017 14,562 15,026
OPERATING EXPENSES:      
Fuel 1,383 1,666 1,855
Purchased power 3,194 3,843 4,423
Other operating expenses 4,232 3,851 3,740
Pension and OPEB mark-to-market adjustment 141 147 242
Provision for depreciation 1,138 1,313 1,282
General taxes 1,043 1,042 978
Impairment of assets and related charges (Note 2) 2,406 10,665 42
Total operating expenses 13,845 22,824 12,734
OPERATING INCOME (LOSS) 172 (8,262) 2,292
OTHER INCOME (EXPENSE):      
Investment income (loss) 98 84 (22)
Interest expense (1,178) (1,157) (1,132)
Capitalized interest 79 103 117
Total other expense (1,001) (970) (1,399)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) (829) (9,232) 893
INCOME TAXES (BENEFITS) 895 (3,055) 315
NET INCOME (LOSS) (1,724) (6,177) 578
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)      
NET INCOME (LOSS) (1,724) (6,177) 578
OTHER COMPREHENSIVE INCOME (LOSS):      
Pension and OPEB prior service costs (85) (59) (116)
Amortized gain on derivative hedges 10 8 5
Change in unrealized gain on available-for-sale securities 22 55 (11)
Other comprehensive income (loss) (53) 4 (122)
Income taxes (benefits) on other comprehensive income (loss) (21) 1 (47)
Other comprehensive income (loss), net of tax (32) 3 (75)
FES      
REVENUES:      
Other 65 160 188
Total revenues [2] 3,098 4,398 5,005
OPERATING EXPENSES:      
Fuel 599 780 871
Other operating expenses 1,514 1,277 1,308
Pension and OPEB mark-to-market adjustment 24 48 57
Provision for depreciation 109 336 324
General taxes 58 88 98
Impairment of assets and related charges (Note 2) 2,031 8,622 33
Total operating expenses 5,164 12,795 4,728
OPERATING INCOME (LOSS) (2,066) (8,397) 277
OTHER INCOME (EXPENSE):      
Investment income (loss) 94 67 (14)
Miscellaneous income 7 7 3
Capitalized interest 26 34 35
Total other expense (30) (46) (130)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) (2,096) (8,443) 147
INCOME TAXES (BENEFITS) 295 (2,988) 65
NET INCOME (LOSS) (2,391) (5,455) 82
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)      
NET INCOME (LOSS) (2,391) (5,455) 82
OTHER COMPREHENSIVE INCOME (LOSS):      
Pension and OPEB prior service costs (14) (14) (6)
Amortized gain on derivative hedges 2 0 (3)
Change in unrealized gain on available-for-sale securities 30 52 (9)
Other comprehensive income (loss) 18 38 (18)
Income taxes (benefits) on other comprehensive income (loss) 6 15 (7)
Other comprehensive income (loss), net of tax 12 23 (11)
COMPREHENSIVE INCOME (LOSS) (2,379) (5,432) 71
FES | Affiliates      
REVENUES:      
Electric sales 366 459 666
OPERATING EXPENSES:      
Purchased power 201 624 353
OTHER INCOME (EXPENSE):      
Interest expense (19) (7) (7)
FES | Non-Affiliates      
REVENUES:      
Electric sales 2,667 3,779 4,151
OPERATING EXPENSES:      
Purchased power 628 1,020 1,684
OTHER INCOME (EXPENSE):      
Interest expense $ (138) $ (147) $ (147)
[1] Includes excise tax collections of $390 million, $406 million and $416 million in 2017, 2016 and 2015, respectively.
[2] Includes excise tax collections of $20 million, $28 million and $44 million in 2017, 2016 and 2015, respectively.