BUSINESS SEGMENT INFORMATION - Financial Segment Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Operating Expenses:
Lease operating expenses		$ 352	$ 359	$ 666	$ 703
Taxes other than income		47	78	97	148
Exploration		37	15	81	40
Depreciation, depletion, and amortization		339	278	647	569
Asset retirement obligation accretion		29	29	57	58
Impairments		46	0	46	0
Total operating expenses		1,056	1,381	2,089	2,572
Operating Income (Loss)		688	1,666	1,600	3,144
Other Income (Expense):
Derivative instrument losses, net		0	(32)	0	(94)
Gain (loss) on divestitures, net		5	(27)	6	1,149
Other, net		109	64	77	109
General and administrative		(66)	(83)	(124)	(234)
Transaction, reorganization, and separation		(2)	(3)	(6)	(17)
Financing costs, net		(42)	(62)	(91)	(202)
NET INCOME BEFORE INCOME TAXES		692	1,523	1,462	3,855
Total assets		14,572	13,839	14,572	13,839	$ 14,255
Operating Segments | Egypt
Operating Expenses:
Lease operating expenses		121	131	218	262
Taxes other than income		0	0	0	0
Exploration		30	12	66	27
Depreciation, depletion, and amortization		126	91	249	188
Asset retirement obligation accretion		0	0	0	0
Impairments		0		0
Total operating expenses		283	239	546	487
Operating Income (Loss)		425	754	884	1,397
Other Income (Expense):
Total assets		3,365	3,107	3,365	3,107
Impairments of oil and gas properties			1		2
Operating Segments | North Sea
Operating Expenses:
Lease operating expenses		99	118	176	214
Taxes other than income		0	0	0	0
Exploration		4	2	9	7
Depreciation, depletion, and amortization		61	54	119	116
Asset retirement obligation accretion		19	20	37	40
Impairments		46		46
Total operating expenses		241	206	410	401
Operating Income (Loss)		37	177	220	425
Other Income (Expense):
Total assets		1,719	2,103	1,719	2,103
Impairments of oil and gas properties		3		6
Operating Segments | U.S.
Operating Expenses:
Lease operating expenses		132	110	272	228
Taxes other than income		47	78	97	145
Exploration		3	1	6	5
Depreciation, depletion, and amortization		152	133	279	263
Asset retirement obligation accretion		10	9	20	17
Impairments		0		0
Total operating expenses		532	936	1,133	1,691
Operating Income (Loss)		226	735	496	1,313
Other Income (Expense):
Total assets		9,489	8,629	9,489	8,629
Impairments of oil and gas properties		3	1	5	4
Reportable Legal Entities | Altus Midstream
Operating Expenses:
Lease operating expenses		0	0	0	0
Taxes other than income		0	0	0	3
Exploration		0	0	0	0
Depreciation, depletion, and amortization		0	0	0	2
Asset retirement obligation accretion		0	0	0	1
Impairments		0		0
Total operating expenses		0	0	0	11
Operating Income (Loss)		0	0	0	10
Other Income (Expense):
Total assets		0	0	0	0
Intersegment Eliminations & Other
Operating Expenses:
Lease operating expenses		0	0	0	(1)
Taxes other than income		0	0	0	0
Exploration		0	0	0	1
Depreciation, depletion, and amortization		0	0	0	0
Asset retirement obligation accretion		0	0	0	0
Impairments		0		0
Total operating expenses		0	0	0	(18)
Operating Income (Loss)		0	0	0	(1)
Other Income (Expense):
Total assets		(1)	0	(1)	0
Oil and gas
Segment Reporting Information [Line Items]
Revenues		1,744	3,047	3,689	5,716
Oil and gas | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Revenues		708	993	1,430	1,884
Oil and gas | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Revenues		278	383	630	826
Oil and gas | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Revenues		758	1,671	1,629	3,004
Oil and gas | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Revenues		0	0	0	21
Oil and gas | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Revenues		0	0	0	(19)
Gathering, processing, and transmission costs
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	[1]	1,600	2,525	3,306	4,845
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs	[1]	75	94	148	175
Gathering, processing, and transmission costs | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		708	993	1,430	1,884
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		6	5	13	10
Gathering, processing, and transmission costs | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		278	383	630	826
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		12	12	23	24
Gathering, processing, and transmission costs | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		614	1,149	1,246	2,138
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		57	77	112	154
Gathering, processing, and transmission costs | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0	0	0	0
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		0	0	0	5
Gathering, processing, and transmission costs | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0	0	0	(3)
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		0	0	0	(18)
Purchased oil and gas sales
Segment Reporting Information [Line Items]
Purchased oil and gas sales	[1]	144	522	383	871
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs	[1]	131	528	347	879
Purchased oil and gas sales | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Purchased oil and gas sales		0	0	0	0
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		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
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		0	0	0	0
Purchased oil and gas sales | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Purchased oil and gas sales		144	522	383	866
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		131	528	347	879
Purchased oil and gas sales | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Purchased oil and gas sales		0	0	0	5
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		0	0	0	0
Purchased oil and gas sales | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Purchased oil and gas sales		0	0	0	0
Operating Expenses:
Gathering, processing, and transmission/Purchased oil and gas costs		0	0	0	0
Midstream service affiliate revenues | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Purchased oil and gas sales					16
Midstream service affiliate revenues | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Purchased oil and gas sales					(16)
Oil revenues
Other Income (Expense):
Revenue from non-customers		165	302	337	552
Oil revenues | Gathering, processing, and transmission costs
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		1,326	1,863	2,676	3,580
Oil revenues | Gathering, processing, and transmission costs | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		618	902	1,247	1,692
Oil revenues | Gathering, processing, and transmission costs | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		235	307	517	635
Oil revenues | Gathering, processing, and transmission costs | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		473	654	912	1,253
Oil revenues | Gathering, processing, and transmission costs | 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 | Gathering, processing, and transmission costs | 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		24	30	50	61
Natural gas revenues | Gathering, processing, and transmission costs
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		175	433	413	813
Natural gas revenues | Gathering, processing, and transmission costs | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		90	88	183	186
Natural gas revenues | Gathering, processing, and transmission costs | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		39	64	99	163
Natural gas revenues | Gathering, processing, and transmission costs | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		46	281	131	464
Natural gas revenues | Gathering, processing, and transmission costs | 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 | Gathering, processing, and transmission costs | 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		0	1	0	2
Natural gas liquids revenues | Gathering, processing, and transmission costs
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		99	229	217	452
Natural gas liquids revenues | Gathering, processing, and transmission costs | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		0	3	0	6
Natural gas liquids revenues | Gathering, processing, and transmission costs | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		4	12	14	28
Natural gas liquids revenues | Gathering, processing, and transmission costs | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		95	214	203	421
Natural gas liquids revenues | Gathering, processing, and transmission costs | 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 | Gathering, processing, and transmission costs | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues		$ 0	$ 0	$ 0	$ (3)

[1] For transactions associated with Kinetik, refer to Note 7—Equity Method Interests for further detail.