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

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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