EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Earnings attributable to FE	$ 292	$ 288
Share count information:
Weighted average number of basic shares outstanding (in shares)	572	570
Assumed exercise of dilutive stock options and awards (in shares)	1	1
Weighted average number of diluted shares outstanding	573	571
EPS Attributable to FE:
Basic EPS (in dollars per share)	$ 0.51	$ 0.51
Diluted EPS (in dollars per share)	$ 0.51	$ 0.50