EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Earnings attributable to FE	$ 235	$ 187	$ 527	$ 475
Share count information:
Weighted average number of basic shares outstanding (in shares)	573	571	573	571
Assumed exercise of dilutive stock options and awards (in shares)	1	1	1	1
Weighted average number of diluted shares outstanding	574	572	574	572
EPS attributable to FE:
Basic EPS (in dollars per share)	$ 0.41	$ 0.33	$ 0.92	$ 0.83
Diluted EPS (in dollars per share)	$ 0.41	$ 0.33	$ 0.92	$ 0.83