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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Earnings Attributable to FE $ 441 $ 419 $ 1,069 $ 717
Share count information:        
Weighted average number of basic shares outstanding (in shares) 577 576 577 575
Assumed exercise of dilutive share-based awards (in shares) 1 1 1 1
Weighted average number of diluted shares outstanding (in shares) 578 577 578 576
EPS Attributable to FE:        
Basic EPS (in dollars per share) $ 0.76 $ 0.73 $ 1.85 $ 1.25
Diluted EPS (in dollars per share) $ 0.76 $ 0.73 $ 1.85 $ 1.24