PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 2025

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 March 31,
(In millions)	2025		2024
Service cost	$	7	$	7
Interest cost	53		55
Expected return on plan assets	(79)		(80)
Amortization:
Prior service costs	4		4
Net actuarial gain	(2)		—
Net periodic benefit credits	$	(17)	$	(14)

OPEB COSTS (CREDITS)

	Three Months Ended March 31,
(In millions)	2025		2024
Service cost	$	2	$	2
Interest cost	14		12
Expected return on plan assets	(11)		(11)
Termination benefits1	—		2
Amortization:
Prior service credits	(3)		(4)
Net actuarial gain	(33)		(38)
Net periodic benefit credits	$	(31)	$	(37)
1 The termination benefits relate to the announcement of the indefinite idle of our Weirton tinplate production plant.