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DERIVATIVES - Fair Value (Details) - Commodity Contracts - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value of Derivatives
Total derivatives	$ 0	$ 0
Other current assets
Fair Value of Derivatives
Netting	(21)	(10)
Other assets
Fair Value of Derivatives
Netting	(63)	0
Accrued liabilities
Fair Value of Derivatives
Netting	21	10
Other long-term liabilities
Fair Value of Derivatives
Netting	63	0
Gross Amounts at Fair Value
Fair Value of Derivatives
Total derivatives	(56)	35
Gross Amounts at Fair Value | Other current assets
Fair Value of Derivatives
Gross Amounts at Fair Value	21	49
Gross Amounts at Fair Value | Other assets
Fair Value of Derivatives
Gross Amounts at Fair Value	63	1
Gross Amounts at Fair Value | Accrued liabilities
Fair Value of Derivatives
Gross Amounts at Fair Value	(71)	(15)
Gross Amounts at Fair Value | Other long-term liabilities
Fair Value of Derivatives
Gross Amounts at Fair Value	(69)	0
Net Fair Value
Fair Value of Derivatives
Total derivatives	(56)	35
Net Fair Value | Other current assets
Fair Value of Derivatives
Net Fair Value	0	39
Net Fair Value | Other assets
Fair Value of Derivatives
Net Fair Value	0	1
Net Fair Value | Accrued liabilities
Fair Value of Derivatives
Net Fair Value	(50)	(5)
Net Fair Value | Other long-term liabilities
Fair Value of Derivatives
Net Fair Value	$ (6)	$ 0

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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