BUSINESS SEGMENT INFORMATION - Financial Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022		Mar. 31, 2021	Dec. 31, 2021	[1]
Segment Reporting Information [Line Items]
Lease operating expenses	$ 344		$ 264
Taxes other than income	70		44
Exploration	25		46
Depreciation, depletion, and amortization	291		342
Asset retirement obligation accretion	29		28
Total operating expenses	1,191		1,276
Operating Income (Loss)	1,478		595
Other Income (Expense):
Derivative instrument gains, net	(62)		158
Gain on divestitures, net	1,176		2
Other, net	45		61
General and administrative	(151)		(83)
Transaction, reorganization, and separation	(14)		0
Financing costs, net	(140)		(107)
NET INCOME BEFORE INCOME TAXES	2,332		626
Total assets	13,494	[1]	13,975	$ 14,393
Operating Segments | Egypt(1)
Segment Reporting Information [Line Items]
Lease operating expenses	131		104
Taxes other than income	0		0
Exploration	15		8
Depreciation, depletion, and amortization	97		130
Asset retirement obligation accretion	0		0
Total operating expenses	248		243
Operating Income (Loss)	643		231
Other Income (Expense):
Total assets	2,966		3,020
Impairments of oil and gas properties	1		2
Operating Segments | North Sea
Segment Reporting Information [Line Items]
Lease operating expenses	96		75
Taxes other than income	0		0
Exploration	5		20
Depreciation, depletion, and amortization	62		84
Asset retirement obligation accretion	20		19
Total operating expenses	195		210
Operating Income (Loss)	248		68
Other Income (Expense):
Total assets	2,169		2,167
Operating Segments | U.S.
Segment Reporting Information [Line Items]
Lease operating expenses	118		86
Taxes other than income	67		40
Exploration	4		16
Depreciation, depletion, and amortization	130		125
Asset retirement obligation accretion	8		8
Total operating expenses	755		836
Operating Income (Loss)	578		280
Other Income (Expense):
Total assets	8,359		6,959
Impairments of oil and gas properties	3		16
Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Purchased oil and gas sales	16		32
Lease operating expenses	0		0
Taxes other than income	3		4
Exploration	0		0
Depreciation, depletion, and amortization	2		3
Asset retirement obligation accretion	1		1
Total operating expenses	11		17
Operating Income (Loss)	10		18
Other Income (Expense):
Total assets	0		1,828
Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Purchased oil and gas sales	(16)		(32)
Lease operating expenses	(1)		(1)
Taxes other than income	0		0
Exploration	1		2
Depreciation, depletion, and amortization	0		0
Asset retirement obligation accretion	0		0
Total operating expenses	(18)		(30)
Operating Income (Loss)	(1)		(2)
Other Income (Expense):
Total assets	0		1
Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	2,320		1,431
Cost of oil and gas purchased	81		58
Oil and gas, excluding purchased | Operating Segments | Egypt(1)
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	891		474
Cost of oil and gas purchased	5		1
Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	443		278
Cost of oil and gas purchased	12		12
Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	989		679
Cost of oil and gas purchased	77		69
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
Cost of oil and gas purchased	5		7
Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	(3)
Cost of oil and gas purchased	(18)		(31)
Purchased oil and gas sales
Segment Reporting Information [Line Items]
Purchased oil and gas sales	349		440
Cost of oil and gas purchased	351		494
Purchased oil and gas sales | Operating Segments | Egypt(1)
Segment Reporting Information [Line Items]
Purchased oil and gas sales	0		0
Cost of oil and gas purchased	0		0
Purchased oil and gas sales | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Purchased oil and gas sales	0		0
Cost of oil and gas purchased	0		0
Purchased oil and gas sales | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Purchased oil and gas sales	344		437
Cost of oil and gas purchased	351		492
Purchased oil and gas sales | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Purchased oil and gas sales	5		3
Cost of oil and gas purchased	0		2
Purchased oil and gas sales | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Purchased oil and gas sales	0		0
Cost of oil and gas purchased	0		0
Oil and gas
Segment Reporting Information [Line Items]
Total revenues	2,669		1,871
Oil and gas | Operating Segments | Egypt(1)
Segment Reporting Information [Line Items]
Total revenues	891		474
Oil and gas | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Total revenues	443		278
Oil and gas | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Total revenues	1,333		1,116
Oil and gas | Reportable Legal Entities | Altus Midstream
Segment Reporting Information [Line Items]
Total revenues	21		35
Oil and gas | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Total revenues	(19)		(32)
Oil revenues
Other Income (Expense):
Revenue from non-customers	250		93
Oil revenues | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	1,717		991
Oil revenues | Oil and gas, excluding purchased | Operating Segments | Egypt(1)
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	790		402
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	328		241
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	599		348
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
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
Natural gas revenues
Other Income (Expense):
Revenue from non-customers	31		12
Natural gas revenues | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	380		312
Natural gas revenues | Oil and gas, excluding purchased | Operating Segments | Egypt(1)
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	98		70
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	99		31
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	183		211
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
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
Natural gas liquids revenues
Other Income (Expense):
Revenue from non-customers	1		1
Natural gas liquids revenues | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	223		128
Natural gas liquids revenues | Oil and gas, excluding purchased | Operating Segments | Egypt(1)
Segment Reporting Information [Line Items]
Oil, natural gas, and natural gas liquids production revenues	3		2
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	16		6
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	207		120
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
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	$ (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.