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Consolidated Statements of Comprehensive Income (Loss) (FirstEnergy Corp.) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
NET INCOME (LOSS) $ (6,177) $ 578 $ 299
OTHER COMPREHENSIVE INCOME (LOSS):      
Pension and OPEB prior service costs (59) (116) (76)
Amortized losses (gains) on derivative hedges 8 5 (2)
Change in unrealized gain on available-for-sale securities 55 (11) 26
Other comprehensive income (loss) 4 (122) (52)
Income taxes (benefits) on other comprehensive income (loss) 1 (47) (14)
Other comprehensive income (loss), net of tax 3 (75) (38)
COMPREHENSIVE INCOME (LOSS) $ (6,174) $ 503 $ 261