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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Statement of Comprehensive Income [Abstract]        
Net income $ 192 $ 58 $ 480 $ 393
OTHER COMPREHENSIVE INCOME (LOSS):        
Pension and OPEB prior service costs (2) (4) (4) (7)
Amortized losses on derivative hedges 8 1 8 1
Other comprehensive income (loss) 6 (3) 4 (6)
Income taxes (benefits) on other comprehensive income (loss) 2 (1) 1 (2)
Other comprehensive income (loss), net of tax 4 (2) 3 (4)
COMPREHENSIVE INCOME 196 56 483 389
Comprehensive income attributable to noncontrolling interest 5 0 5 0
COMPREHENSIVE INCOME ATTRIBUTABLE TO FIRSTENERGY CORP. $ 191 $ 56 $ 478 $ 389