Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 439	$ 1,283	$ 1,079
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(9)	(14)	(34)
Amortized losses on derivative hedges	9	1	1
Other comprehensive loss	0	(13)	(33)
Income tax benefits on other comprehensive loss	(1)	(3)	(8)
Other comprehensive income (loss), net of tax	1	(10)	(25)
COMPREHENSIVE INCOME	440	1,273	1,054
Income attributable to noncontrolling interest (continuing operations)	33	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO FIRSTENERGY CORP.	$ 407	$ 1,273	$ 1,054