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ACQUISITIONS AND DIVESTITURES - Other Upstream Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
JOINT VENTURES
Purchase price	$ 518
Other upstream acquisitions
JOINT VENTURES
Purchase price		$ 6	$ 39
ARO liabilities assumed		$ 1