PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2024

Postemployment Benefits [Abstract]

Schedule of Net Benefit Costs

The following are the components of defined benefit pension and OPEB costs (credits):

DEFINED BENEFIT PENSION COSTS (CREDITS)

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2024		2023		2024		2023
Service cost	$	7	$	8	$	21	$	24
Interest cost	54		59		163		176
Expected return on plan assets	(80)		(79)		(240)		(236)
Amortization:
Prior service costs	5		5		13		13
Net actuarial loss	—		—		—		2
Net periodic benefit credits	$	(14)	$	(7)	$	(43)	$	(21)

OPEB COSTS (CREDITS)

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2024		2023		2024		2023
Service cost	$	2	$	2	$	6	$	7
Interest cost	13		15		38		47
Expected return on plan assets	(11)		(10)		(32)		(31)
Termination benefits1	—		—		2		—
Amortization:
Prior service credits	(4)		(4)		(12)		(12)
Net actuarial gain	(39)		(36)		(116)		(109)
Net periodic benefit credits	$	(39)	$	(33)	$	(114)	$	(98)
1 The termination benefits relate to the announcement of the indefinite idle of our Weirton tinplate production plant.