PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2024

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Costs

The components of FirstEnergy’s net periodic benefit costs (credits) for pension and OPEB were as follows:

Components of Net Periodic Benefit Costs (Credits)	Pension				OPEB
For the Three Months Ended September 30,	2024		2023		2024		2023
	(In millions)
Service costs	$	35	$	35	$	1	$	1
Interest costs	99		106		5		5
Expected return on plan assets	(132)		(151)		(9)		(7)
Amortization of prior service costs (credits)	—		1		—		(3)
Special termination benefits(1)	—		13		—		5
Net periodic benefit costs (credits)	$	2	$	4	$	(3)	$	1
Net periodic benefit costs (credits), net of amounts capitalized	$	(15)	$	(15)	$	(4)	$	1

(1) Related to benefits provided in connection with the PEER program.

Components of Net Periodic Benefit Costs (Credits)	Pension				OPEB
For the Nine Months Ended September 30,	2024		2023		2024		2023
	(In millions)
Service cost	$	105	$	104	$	2	$	2
Interest cost	298		322		15		16
Expected return on plan assets	(397)		(421)		(26)		(23)
Amortization of prior service cost (credit)(1)	1		2		(1)		(7)
Special termination benefits(2)	—		18		—		7
Pensions & OPEB mark-to-market adjustment	—		(59)		—		—
Net periodic benefit costs (credits)	7		(34)		(10)		(5)
Net periodic benefit costs (credits), net of amounts capitalized	$	(45)	$	(88)	$	(11)	$	(6)

(1) The income tax benefits associated with the pension and OPEB prior service costs amortized out of AOCI were $1 million for the nine months ended September 30, 2023. Amounts were immaterial for the nine months ended September 30, 2024.

(2) Related to benefits provided in connection with the PEER program.