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POSTRETIREMENT BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Effect on Operations of Pension Plans
PRINCIPAL PENSION PLANSThree months ended September 30Nine months ended September 30
(In millions)2020201920202019
Service cost for benefits earned$156 $154 $501 $472 
Prior service cost amortization36 34 110 101 
Expected return on plan assets(747)(863)(2,243)(2,588)
Interest cost on benefit obligations588 724 1,764 2,173 
Net actuarial loss amortization850 767 2,549 2,300 
Curtailment/settlement loss (gain)— — — 51 
Benefit plans cost$883 $816 $2,681 $2,509