CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 466	$ 420	$ 831	$ 984
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service credits	0	(2)	0	(5)
Amortized losses on derivative hedges	0	0	4	2
Other comprehensive income (loss)	0	(2)	4	(3)
Income taxes (benefits) on other comprehensive income (loss)	0	(1)	1	(1)
Other comprehensive income (loss), net of tax	0	(1)	3	(2)
COMPREHENSIVE INCOME	466	419	834	982
Income attributable to noncontrolling interest	47	20	114	57
COMPREHENSIVE INCOME ATTRIBUTABLE TO FIRSTENERGY CORP.	$ 419	$ 399	$ 720	$ 925