STATEMENT OF CONSOLIDATED OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUES AND OTHER:
Derivative instrument losses, net	$ (223)	$ (35)	$ (17)
Gain on divestitures, net	32	43	23
Other	64	54	53
Total revenues and other	4,308	6,553	7,764
OPERATING EXPENSES:
Lease operating expenses	1,127	1,447	1,439
Taxes other than income	123	207	215
Exploration	274	805	503
General and administrative	290	406	431
Transaction, reorganization, and separation	54	50	28
Depreciation, depletion, and amortization	1,772	2,680	2,405
Asset retirement obligation accretion	109	107	108
Impairments	4,501	2,949	511
Financing costs, net	267	462	478
Total operating expenses	9,148	9,561	6,806
NET INCOME (LOSS) BEFORE INCOME TAXES	(4,840)	(3,008)	958
Current income tax provision	176	660	894
Deferred income tax provision (benefit)	(112)	14	(222)
NET INCOME (LOSS) INCLUDING NONCONTROLLING INTERESTS	(4,904)	(3,682)	286
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ (4,860)	$ (3,553)	$ 40
NET INCOME (LOSS) PER COMMON SHARE:
Basic (in USD per share)	$ (12.86)	$ (9.43)	$ 0.11
Diluted (in USD per share)	$ (12.86)	$ (9.43)	$ 0.11
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic (in shares)	378	377	382
Diluted (in shares)	378	377	384
Noncontrolling Interest, Egypt
OPERATING EXPENSES:
Net income (loss) attributable to noncontrolling interest	$ (121)	$ 167	$ 245
Noncontrolling Interest, Altus
OPERATING EXPENSES:
Net income (loss) attributable to noncontrolling interest	1	(334)	1
Oil and gas, excluding purchased
REVENUES AND OTHER:
Oil and gas production revenues	4,037	6,315	7,348
OPERATING EXPENSES:
Cost of goods and services sold	274	306	348
Oil and gas, purchased
REVENUES AND OTHER:
Oil and gas production revenues	398	176	357
OPERATING EXPENSES:
Cost of goods and services sold	357	142	340
Oil and gas
REVENUES AND OTHER:
Oil and gas production revenues	$ 4,435	$ 6,491	$ 7,705