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DERIVATIVES - Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Interest Rate Contracts
Fair Value of Derivatives
Gain on interest rate contracts	$ 1
Interest Rate Contracts | Other assets
Fair Value of Derivatives
Net Fair Value Presented in the Balance Sheet	9
Presented in the Balance Sheet | Commodity Contracts
Fair Value of Derivatives
Total derivatives	(153)	$ (133)
Presented in the Balance Sheet | Commodity Contracts | Other current assets
Fair Value of Derivatives
Net Fair Value Presented in the Balance Sheet	34	23
Presented in the Balance Sheet | Commodity Contracts | Other assets
Fair Value of Derivatives
Net Fair Value Presented in the Balance Sheet	13	1
Presented in the Balance Sheet | Commodity Contracts | Accrued liabilities
Fair Value of Derivatives
Net Fair Value Presented in the Balance Sheet	(191)	(154)
Presented in the Balance Sheet | Commodity Contracts | Other long-term liabilities
Fair Value of Derivatives
Net Fair Value Presented in the Balance Sheet	(9)	(3)
Recognized Fair Value | Commodity Contracts
Fair Value of Derivatives
Total derivatives	(153)	(133)
Recognized Fair Value | Commodity Contracts | Other current assets
Fair Value of Derivatives
Gross Amounts Recognized at Fair Value	34	39
Gross Amounts Offset in the Balance Sheet		(16)
Recognized Fair Value | Commodity Contracts | Other assets
Fair Value of Derivatives
Gross Amounts Recognized at Fair Value	13	1
Recognized Fair Value | Commodity Contracts | Accrued liabilities
Fair Value of Derivatives
Gross Amounts Recognized at Fair Value	(191)	(170)
Gross Amounts Offset in the Balance Sheet		16
Recognized Fair Value | Commodity Contracts | Other long-term liabilities
Fair Value of Derivatives
Gross Amounts Recognized at Fair Value	$ (9)	$ (3)

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