BUSINESS SEGMENT INFORMATION - Financial Segment Information (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2022		Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021	Dec. 31, 2021	[1]
Segment Reporting Information [Line Items]
Lease operating expenses		$ 359		$ 311	$ 703		$ 575
Taxes other than income		78		51	148		95
Exploration		15		19	40		65
Depreciation, depletion, and amortization		278		351	569		693
Asset retirement obligation accretion		29		28	58		56
Total operating expenses		1,381		1,083	2,572		2,359
Operating Income (Loss)		1,666		673	3,144		1,268
Other Income (Expense):
Derivative instrument losses, net		(32)		(113)	(94)		45
Loss on divestitures, net		(27)		65	1,149		67
Other, net		64		74	109		135
General and administrative		(83)		(79)	(234)		(162)
Transaction, reorganization, and separation		(3)		(4)	(17)		(4)
Financing costs, net		(62)		(94)	(202)		(201)
NET INCOME BEFORE INCOME TAXES		1,523		522	3,855		1,148
Total assets		13,839	[1]	14,388	13,839	[1]	14,388	$ 14,393
Operating Segments | Egypt
Segment Reporting Information [Line Items]
Lease operating expenses		131		114	262		218
Taxes other than income		0		0	0		0
Exploration		12		14	27		22
Depreciation, depletion, and amortization		91		137	188		267
Asset retirement obligation accretion		0		0	0		0
Total operating expenses		239		268	487		511
Operating Income (Loss)		754		231	1,397		462
Other Income (Expense):
Total assets		3,107		3,116	3,107		3,116
Impairments of oil and gas properties		1		2	2		4
Operating Segments | North Sea
Segment Reporting Information [Line Items]
Lease operating expenses		118		98	214		173
Taxes other than income		0		0	0		0
Exploration		2		3	7		23
Depreciation, depletion, and amortization		54		63	116		147
Asset retirement obligation accretion		20		20	40		39
Total operating expenses		206		192	401		402
Operating Income (Loss)		177		55	425		123
Other Income (Expense):
Total assets		2,103		2,127	2,103		2,127
Operating Segments | U.S.
Segment Reporting Information [Line Items]
Lease operating expenses		110		99	228		185
Taxes other than income		78		47	145		87
Exploration		1		2	5		18
Depreciation, depletion, and amortization		133		148	263		273
Asset retirement obligation accretion		9		7	17		15
Total operating expenses		936		636	1,691		1,472
Operating Income (Loss)		735		371	1,313		651
Other Income (Expense):
Total assets		8,629		7,305	8,629		7,305
Impairments of oil and gas properties		1		1	4		17
Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Lease operating expenses		0		0	0		0
Taxes other than income		0		4	3		8
Exploration		0		0	0		0
Depreciation, depletion, and amortization		0		3	2		6
Asset retirement obligation accretion		0		1	1		2
Total operating expenses		0		19	11		36
Operating Income (Loss)		0		16	10		34
Other Income (Expense):
Total assets		0		1,839	0		1,839
Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Lease operating expenses		0		0	(1)		(1)
Taxes other than income		0		0	0		0
Exploration		0		0	1		2
Depreciation, depletion, and amortization		0		0	0		0
Asset retirement obligation accretion		0		0	0		0
Total operating expenses		0		(32)	(18)		(62)
Operating Income (Loss)		0		0	(1)		(2)
Other Income (Expense):
Total assets		0		1	0		1
Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		2,525		1,514	4,845		2,945
Cost of oil and gas purchased	[2]	94		61	175		119
Oil and gas, excluding purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		993		499	1,884		973
Cost of oil and gas purchased		5		3	10		4
Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		383		247	826		525
Cost of oil and gas purchased		12		8	24		20
Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		1,149		768	2,138		1,447
Cost of oil and gas purchased		77		74	154		143
Oil and gas, excluding purchased | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0		0	0		0
Cost of oil and gas purchased		0		8	5		15
Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0		0	(3)		0
Cost of oil and gas purchased		0		(32)	(18)		(63)
Purchased oil and gas sales
Segment Reporting Information [Line Items]
Purchased oil and gas sales		522		242	871		682
Cost of oil and gas purchased		528		262	879		756
Purchased oil and gas sales | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Purchased oil and gas sales		0		0	0		0
Cost of oil and gas purchased		0		0	0		0
Purchased oil and gas sales | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Purchased oil and gas sales		0		0	0		0
Cost of oil and gas purchased		0		0	0		0
Purchased oil and gas sales | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Purchased oil and gas sales		522		239	866		676
Cost of oil and gas purchased		528		259	879		751
Purchased oil and gas sales | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Purchased oil and gas sales		0		3	5		6
Cost of oil and gas purchased		0		3	0		5
Purchased oil and gas sales | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Purchased oil and gas sales		0		0	0		0
Cost of oil and gas purchased		0		0	0		0
Midstream service affiliate revenues
Segment Reporting Information [Line Items]
Purchased oil and gas sales					0
Midstream service affiliate revenues | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Purchased oil and gas sales				32	16		64
Midstream service affiliate revenues | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Purchased oil and gas sales				(32)	(16)		(64)
Oil and gas
Segment Reporting Information [Line Items]
Total revenues		3,047		1,756	5,716		3,627
Oil and gas | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Total revenues		993		499	1,884		973
Oil and gas | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Total revenues		383		247	826		525
Oil and gas | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Total revenues		1,671		1,007	3,004		2,123
Oil and gas | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Total revenues		0		35	21		70
Oil and gas | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Total revenues		0		(32)	(19)		(64)
Oil revenues
Other Income (Expense):
Revenue from non-customers		302		97	552		190
Oil revenues | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		1,863		1,141	3,580		2,132
Oil revenues | Oil and gas, excluding purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		902		432	1,692		834
Oil revenues | Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		307		216	635		457
Oil revenues | Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		654		493	1,253		841
Oil revenues | Oil and gas, excluding purchased | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0		0	0		0
Oil revenues | Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0		0	0		0
Natural gas revenues
Other Income (Expense):
Revenue from non-customers		30		10	61		22
Natural gas revenues | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		433		226	813		538
Natural gas revenues | Oil and gas, excluding purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		88		65	186		135
Natural gas revenues | Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		64		27	163		58
Natural gas revenues | Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		281		134	464		345
Natural gas revenues | Oil and gas, excluding purchased | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0		0	0		0
Natural gas revenues | Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0		0	0		0
Natural gas liquids revenues
Other Income (Expense):
Revenue from non-customers		1		0	2		1
Natural gas liquids revenues | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		229		147	452		275
Natural gas liquids revenues | Oil and gas, excluding purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		3		2	6		4
Natural gas liquids revenues | Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		12		4	28		10
Natural gas liquids revenues | Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		214		141	421		261
Natural gas liquids revenues | Oil and gas, excluding purchased | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0		0	0		0
Natural gas liquids revenues | Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		$ 0		$ 0	$ (3)		$ 0

[1] The Altus VIE amounts are disclosed as of December 31, 2021. All Altus balances were deconsolidated as of February 22, 2022. Refer to Note 1—Summary of Significant Accounting Policies and Note 3—Acquisitions and Divestitures for further detail.

[2] For gathering, processing, and transmission costs associated with Kinetik, refer to Note 7—Equity Method Interest for further detail.