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EARNINGS PER SHARE OF COMMON STOCK - Schedule of Reconciles Basic and Diluted Eps Attributable to FE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Earnings Attributable to FE $ 268 $ 45 $ 628 $ 298
Share count information:        
Weighted average number of basic shares outstanding (in shares) 577 575 577 575
Assumed exercise of dilutive share-based awards (in shares) 1 1 1 1
Weighted average number of diluted shares outstanding (in shares) 578 576 578 576
EPS Attributable to FE:        
Basic EPS (in dollars per share) $ 0.46 $ 0.08 $ 1.09 $ 0.52
Diluted EPS (in dollars per share) $ 0.46 $ 0.08 $ 1.09 $ 0.52