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BENEFIT PLANS - PENSION BENEFITS AND OTHER POSTRETIREMENT BENEFITS RECOGNIZED IN THE ACCOMPANYING CONSOLIDATED BALANCE SHEETS (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Retirement Benefits [Abstract]    
Deferred tax asset $ 49 $ 40
Total assets 49 40
Current liabilities (10) (9)
Other noncurrent liabilities (452) (384)
Deferred tax liability (1) (1)
Total liabilities (463) (394)
Accumulated other comprehensive income 139 113
Net amount recognized $ (275) $ (241)