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DIVESTITURES AND ACQUISITIONS - Other (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Purchase price	$ 518
Other upstream acquisitions
Business Acquisition [Line Items]
Purchase price		$ 6	$ 39
ARO liabilities assumed			$ 1

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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