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EARNINGS PER SHARE - 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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Earnings attributable to FE $ 45 $ 235 $ 298 $ 527
Share count information:        
Weighted average number of basic shares outstanding (in shares) 575 573 575 573
Assumed exercise of dilutive awards (in shares) 1 1 1 1
Weighted average number of diluted shares outstanding (in shares) 576 574 576 574
EPS attributable to FE:        
Basic EPS (in dollars per share) $ 0.08 $ 0.41 $ 0.52 $ 0.92
Diluted EPS (in dollars per share) $ 0.08 $ 0.41 $ 0.52 $ 0.92