PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

6 Months Ended

Jun. 30, 2021

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)

	(In Millions)
	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Service cost	$	14	$	6	$	28	$	11
Interest cost	26		15		52		23
Expected return on plan assets	(90)		(37)		(180)		(55)
Amortization:
Net actuarial loss	8		6		16		13
Net periodic benefit credits	$	(42)	$	(10)	$	(84)	$	(8)

OPEB Costs (Credits)

	(In Millions)
	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Service cost	$	12	$	1	$	25	$	2
Interest cost	19		5		37		7
Expected return on plan assets	(10)		(4)		(20)		(9)
Amortization:
Prior service credits	—		—		—		(1)
Net actuarial loss	1		—		2		1
Net periodic benefit costs	$	22	$	2	$	44	$	—