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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)
3 Months Ended
Mar. 31, 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
March 31,
20212020
Service cost$14 $
Interest cost26 
Expected return on plan assets(90)(18)
Amortization:
Net actuarial loss8 
Net periodic benefit cost (credit)$(42)$
OPEB Costs (Credits)
(In Millions)
Three Months Ended
March 31,
20212020
Service cost$13 $
Interest cost18 
Expected return on plan assets(10)(5)
Amortization:
Prior service credits (1)
Net actuarial loss1 
Net periodic benefit cost (credit)$22 $(2)