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ACQUISITIONS AND DIVESTITURES (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	May 02, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Leasehold and property acquisitions		$ 15	$ 12
Assets held for sale		217		$ 0
U.S. onshore regions
Business Acquisition [Line Items]
Leasehold and property acquisitions		15	12
Permian region
Business Acquisition [Line Items]
Proceeds from sale of non-core assets		9	9
Gains on sale of non-core assets		3	$ 7
Disposal Group, Held-for-sale, Not Discontinued Operations \| Oklahoma
Business Acquisition [Line Items]
Non-core assets, selling price		245
Assets held for sale		217
Liability held for sale		$ 6
Subsequent Event \| South Texas
Business Acquisition [Line Items]
Proceeds from sale of non-core assets	$ 43