SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule Of Significant Accounting Policies [Line Items]
Impairments	$ 4,472,000,000	$ 0
Impairments of oil and gas properties	4,472,000,000	0
Goodwill impairment	87,000,000	0
Impairment for early termination of drilling rig leases	13,000,000
Inventory write-down	5,000,000
Receivables from contracts with customer, net	715,000,000		$ 945,000,000
Revenues from non-customer	48,000,000	119,000,000
Transaction, reorganization, and separation	27,000,000	4,000,000
Redesign organization structure and operation
Schedule Of Significant Accounting Policies [Line Items]
Transaction, reorganization, and separation	25,000,000
Restructuring cumulative cost incurred to date	53,000,000
Cash payments for restructuring	27,000,000
Other
Schedule Of Significant Accounting Policies [Line Items]
Transaction, reorganization, and separation	2,000,000
Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Impairments of oil and gas properties	4,299,000,000	0
Oil and gas properties impaired, fair value	1,900,000,000
Gathering, processing, and transmission facilities
Schedule Of Significant Accounting Policies [Line Items]
Impairments	68,000,000
Oil and gas properties impaired, fair value	46,000,000
U.S. | Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Impairments of oil and gas properties	3,938,000,000	0
Egypt | Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Impairments of oil and gas properties	354,000,000	0
North Sea | Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Impairments of oil and gas properties	$ 7,000,000	0
Altus Midstream Company
Schedule Of Significant Accounting Policies [Line Items]
Ownership percentage by noncontrolling owners	21.00%
Minimum | Redesign organization structure and operation
Schedule Of Significant Accounting Policies [Line Items]
Estimated additional restructuring expenses	$ 10,000,000
Maximum | Redesign organization structure and operation
Schedule Of Significant Accounting Policies [Line Items]
Estimated additional restructuring expenses	$ 20,000,000
Significant Unobservable Inputs (Level 3) | Discount Rate | Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Oil and gas properties, measurement inputs	0.10
Significant Unobservable Inputs (Level 3) | Discount Rate | Gathering, processing, and transmission facilities
Schedule Of Significant Accounting Policies [Line Items]
Oil and gas properties, measurement inputs	0.10
Oil and gas, purchased
Schedule Of Significant Accounting Policies [Line Items]
Oil and gas production revenues	$ 108,000,000	24,000,000
Cost of goods and services sold	$ 86,000,000	$ 22,000,000