PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
(In millions)	2024		2023		2024		2023
Service cost	$	7	$	8	$	14	$	16
Interest cost	54		58		109		117
Expected return on plan assets	(80)		(78)		(160)		(157)
Amortization:
Prior service costs	4		4		8		8
Net actuarial loss	—		1		—		2
Net periodic benefit credits	$	(15)	$	(7)	$	(29)	$	(14)

OPEB COSTS (CREDITS)

	Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	2024		2023		2024		2023
Service cost	$	2	$	3	$	4	$	5
Interest cost	13		16		25		32
Expected return on plan assets	(10)		(10)		(21)		(21)
Termination benefits1	—		—		2		—
Amortization:
Prior service credits	(4)		(4)		(8)		(8)
Net actuarial gain	(39)		(37)		(77)		(73)
Net periodic benefit credits	$	(38)	$	(32)	$	(75)	$	(65)
1 The termination benefits relate to the announcement of the indefinite idle of our Weirton tinplate production plant.