Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 254	$ 192	$ 564	$ 480
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(1)	(2)	(3)	(4)
Amortized losses on derivative hedges	2	8	2	8
Other comprehensive income (loss)	1	6	(1)	4
Income taxes on other comprehensive income (loss)	1	2	0	1
Other comprehensive income (loss), net of tax	0	4	(1)	3
COMPREHENSIVE INCOME	254	196	563	483
Comprehensive income attributable to noncontrolling interest	19	5	37	5
COMPREHENSIVE INCOME ATTRIBUTABLE TO FIRSTENERGY CORP.	$ 235	$ 191	$ 526	$ 478