SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-Cash Impairments of Proved and Unproved Property and Equipment (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Significant Accounting Policies [Line Items]
Impairments		$ 208	$ 4,501	$ 2,949
Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Impairments		0	4,319	1,484
Oil and Gas Properties, Unproved
Schedule Of Significant Accounting Policies [Line Items]
Impairments		31	101	768
U.S. | Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Impairments	$ 3,900	0	3,938	1,484
U.S. | Oil and Gas Properties, Unproved
Schedule Of Significant Accounting Policies [Line Items]
Impairments		22	92	760
Egypt | Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Impairments	354	0	374	0
Egypt | Oil and Gas Properties, Unproved
Schedule Of Significant Accounting Policies [Line Items]
Impairments		8	8	8
North Sea | Oil and gas proved property
Schedule Of Significant Accounting Policies [Line Items]
Impairments	$ 7	0	7	0
North Sea | Oil and Gas Properties, Unproved
Schedule Of Significant Accounting Policies [Line Items]
Impairments		$ 1	$ 1	$ 0