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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
NET INCOME $ 1,127 $ 1,176 $ 439
OTHER COMPREHENSIVE INCOME (LOSS):      
Pension and OPEB prior service costs 1 (6) (9)
Amortized losses on derivative hedges 3 2 9
Other comprehensive income (loss) 4 (4) 0
Income tax expense (benefits) on other comprehensive loss 1 (1) (1)
Other comprehensive income (loss), net of tax 3 (3) 1
COMPREHENSIVE INCOME 1,130 1,173 440
Comprehensive income attributable to noncontrolling interest 149 74 33
COMPREHENSIVE INCOME ATTRIBUTABLE TO FIRSTENERGY CORP. $ 981 $ 1,099 $ 407