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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020
Schedule Of Significant Accounting Policies [Line Items]
Impairments	$ 18	$ 0		$ 18	$ 4,492
Impairment for early termination of drilling rig leases			$ 13
Inventory write-down			$ 5
Goodwill	0	0		0	87
Gathering, processing and transmission facilities	673			673		$ 670
Accumulated depreciation	33,889			33,889		34,810
Receivables from contracts with customer, net	1,100			1,100		670
Restructuring cumulative cost incurred to date						$ 79
Transaction, reorganization, and separation	4	7		8	44
Egypt
Schedule Of Significant Accounting Policies [Line Items]
Goodwill				87
Separation costs
Schedule Of Significant Accounting Policies [Line Items]
Transaction, reorganization, and separation					41
Consulting fees
Schedule Of Significant Accounting Policies [Line Items]
Transaction, reorganization, and separation					2
Office closure
Schedule Of Significant Accounting Policies [Line Items]
Transaction, reorganization, and separation					1
Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Tangible asset impairment charges	0	0		0	4,319
Impairments of oil and gas properties	0	0		0	4,319
Oil and gas properties impaired, fair value		$ 1,900			$ 1,900
Oil and gas proved property \| Discount Rate \| Significant Unobservable Inputs (Level 3)
Schedule Of Significant Accounting Policies [Line Items]
Oil and gas properties, measurement inputs		0.10	0.10		0.10		0.10
Oil and gas proved property \| U.S.
Schedule Of Significant Accounting Policies [Line Items]
Impairments of oil and gas properties	0	$ 0	$ 3,900	0	$ 3,938
Oil and gas proved property \| Egypt
Schedule Of Significant Accounting Policies [Line Items]
Impairments of oil and gas properties	0	0		0	374
Oil and gas proved property \| North Sea
Schedule Of Significant Accounting Policies [Line Items]
Impairments of oil and gas properties	0	0	7	0	7
Gathering, processing, and transmission facilities
Schedule Of Significant Accounting Policies [Line Items]
Tangible asset impairment charges	$ 0	$ 0		$ 0	$ 68
Oil and gas properties impaired, fair value			46
Gathering, processing, and transmission facilities \| Egypt
Schedule Of Significant Accounting Policies [Line Items]
Impairments			$ 68
Third-Party Investors \| Altus Midstream Company
Schedule Of Significant Accounting Policies [Line Items]
Ownership percentage by noncontrolling owners	21.00%			21.00%
Sinopec \| Apache Egypt
Schedule Of Significant Accounting Policies [Line Items]
Ownership percentage by noncontrolling owners	33.33%			33.33%