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EARNINGS PER SHARE OF COMMON STOCK - Reconciliation of Basic and Diluted EPS Attributable to FE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Earnings Attributable to FE - continuing operations $ 978 $ 1,123 $ 406
Earnings from discontinued operations [1] 0 (21) 0
EARNINGS ATTRIBUTABLE TO FIRSTENERGY CORP. $ 978 $ 1,102 $ 406
Share Count information:      
Weighted average number of basic shares outstanding (in shares) 575 573 571
Assumed exercise of dilutive share-based awards (in shares) 2 1 1
Weighted average number of diluted shares outstanding (in shares) 577 574 572
EPS Attributable to FE:      
Income from continuing operations, basic (in dollars per share) $ 1.70 $ 1.96 $ 0.71
Discontinued operations, basic (in dollars per share) 0 (0.04) 0
Basic EPS (in dollars per share) 1.70 1.92 0.71
Income from continuing operations, diluted (in dollars per share) 1.70 1.96 0.71
Discontinued operations, diluted (in dollars per share) 0 (0.04) 0
Diluted EPS (in dollars per share) $ 1.70 $ 1.92 $ 0.71
[1] Consists of income taxes of $21 million in 2023.