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PENSION AND POSTRETIREMENT BENEFIT PLANS - Obligations and Asset Fair Values (Details) - Pension Benefits - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Pension plans with accumulated benefit obligation in excess of plan assets    
Projected benefit obligation $ 47 $ 45
Accumulated benefit obligation 43 41
Fair value of plan assets $ 32 $ 27