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COMMITMENTS AND CONTINGENCIES - Environmental Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Accrual for Environmental Loss Contingencies $ 135 $ 2
Accrued Environmental Loss Contingencies, Current 18 0
Accrued Environmental Loss Contingencies, Noncurrent $ 117 $ 2