PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(In millions)	2024		2023
Service cost	$	7	$	8
Interest cost	55		59
Expected return on plan assets	(80)		(79)
Amortization:
Prior service costs	4		4
Net actuarial loss	—		1
Net periodic benefit credits	$	(14)	$	(7)

OPEB COSTS (CREDITS)

	Three Months Ended March 31,
(In millions)	2024		2023
Service cost	$	2	$	2
Interest cost	12		16
Expected return on plan assets	(11)		(11)
Termination benefits1	2		—
Amortization:
Prior service credits	(4)		(4)
Net actuarial gain	(38)		(36)
Net periodic benefit credits	$	(37)	$	(33)
1 The termination benefits relate to the announcement of the indefinite idle of our Weirton tinplate production plant.