BUSINESS SEGMENT INFORMATION (Detail)	3 Months Ended
	Mar. 31, 2020 USD ($) Segment	Mar. 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reporting segments | Segment	3
Segment Reporting Information [Line Items]
Lease operating expenses	$ 335,000,000	$ 365,000,000
Taxes other than income	33,000,000	51,000,000
Exploration	57,000,000	69,000,000
Depreciation, depletion, and amortization	566,000,000	646,000,000
Asset retirement obligation accretion	27,000,000	27,000,000
Impairments	4,472,000,000	0
Operating expenses	5,647,000,000	1,268,000,000
Operating Income (Loss)	(4,303,000,000)	410,000,000
Other Income (Expense):
Derivative instrument losses, net	(103,000,000)	(30,000,000)
Gain on divestitures, net	25,000,000	3,000,000
Other, net	13,000,000	6,000,000
General and administrative	(68,000,000)	(123,000,000)
Transaction, reorganization, and separation	(27,000,000)	(4,000,000)
Financing costs, net	(103,000,000)	(97,000,000)
NET INCOME (LOSS) BEFORE INCOME TAXES	(4,566,000,000)	165,000,000
Total Assets	13,391,000,000	21,751,000,000
Revenues from non-customer	48,000,000	119,000,000
Impairments	4,472,000,000	0
Operating Segments | Egypt
Segment Reporting Information [Line Items]
Lease operating expenses	112,000,000	118,000,000
Taxes other than income	0	0
Exploration	18,000,000	32,000,000
Depreciation, depletion, and amortization	161,000,000	188,000,000
Asset retirement obligation accretion	0	0
Impairments	509,000,000
Operating expenses	810,000,000	350,000,000
Operating Income (Loss)	(409,000,000)	249,000,000
Other Income (Expense):
Total Assets	3,151,000,000	4,065,000,000
Impairments	511,000,000
Operating Segments | North Sea
Segment Reporting Information [Line Items]
Lease operating expenses	81,000,000	72,000,000
Taxes other than income	0	0
Exploration	2,000,000	1,000,000
Depreciation, depletion, and amortization	109,000,000	99,000,000
Asset retirement obligation accretion	18,000,000	19,000,000
Impairments	7,000,000
Operating expenses	233,000,000	203,000,000
Operating Income (Loss)	64,000,000	135,000,000
Other Income (Expense):
Total Assets	2,366,000,000	2,601,000,000
Impairments	7,000,000	2,000,000
Operating Segments | U.S.
Segment Reporting Information [Line Items]
Lease operating expenses	143,000,000	176,000,000
Taxes other than income	30,000,000	48,000,000
Exploration	35,000,000	33,000,000
Depreciation, depletion, and amortization	293,000,000	352,000,000
Asset retirement obligation accretion	8,000,000	8,000,000
Impairments	3,956,000,000
Operating expenses	4,625,000,000	720,000,000
Operating Income (Loss)	(3,979,000,000)	21,000,000
Other Income (Expense):
Total Assets	6,225,000,000	13,205,000,000
Impairments	4,000,000,000.0	21,000,000
Operating Segments | Altus Midstream
Segment Reporting Information [Line Items]
Lease operating expenses	0	0
Taxes other than income	3,000,000	3,000,000
Exploration	0	0
Depreciation, depletion, and amortization	3,000,000	7,000,000
Asset retirement obligation accretion	1,000,000	0
Impairments	0
Operating expenses	18,000,000	26,000,000
Operating Income (Loss)	23,000,000	8,000,000
Other Income (Expense):
Total Assets	1,574,000,000	1,825,000,000
Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil and gas production revenues	(41,000,000)	(34,000,000)
Lease operating expenses	(1,000,000)	(1,000,000)
Taxes other than income	0	0
Exploration	2,000,000	3,000,000
Depreciation, depletion, and amortization	0	0
Asset retirement obligation accretion	0	0
Impairments	0
Operating expenses	(39,000,000)	(31,000,000)
Operating Income (Loss)	(2,000,000)	(3,000,000)
Other Income (Expense):
Total Assets	75,000,000	55,000,000
Oil and gas
Segment Reporting Information [Line Items]
Oil and gas production revenues	1,344,000,000	1,678,000,000
Oil and gas | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil and gas production revenues	401,000,000	599,000,000
Oil and gas | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil and gas production revenues	297,000,000	338,000,000
Oil and gas | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil and gas production revenues	646,000,000	741,000,000
Oil and gas | Operating Segments | Altus Midstream
Segment Reporting Information [Line Items]
Oil and gas production revenues	41,000,000	34,000,000
Oil and gas | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil and gas production revenues	(41,000,000)	(34,000,000)
Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil and gas production revenues	1,236,000,000	1,654,000,000
Cost of oil and gas purchased	71,000,000	88,000,000
Oil and gas, excluding purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil and gas production revenues	401,000,000	599,000,000
Cost of oil and gas purchased	10,000,000	12,000,000
Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil and gas production revenues	297,000,000	338,000,000
Cost of oil and gas purchased	16,000,000	12,000,000
Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil and gas production revenues	538,000,000	717,000,000
Cost of oil and gas purchased	74,000,000	81,000,000
Oil and gas, excluding purchased | Operating Segments | Altus Midstream
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Cost of oil and gas purchased	11,000,000	16,000,000
Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Cost of oil and gas purchased	(40,000,000)	(33,000,000)
Oil and gas, purchased
Segment Reporting Information [Line Items]
Oil and gas production revenues	108,000,000	24,000,000
Cost of oil and gas purchased	86,000,000	22,000,000
Oil and gas, purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Cost of oil and gas purchased	0	0
Oil and gas, purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Cost of oil and gas purchased	0	0
Oil and gas, purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil and gas production revenues	108,000,000	24,000,000
Cost of oil and gas purchased	86,000,000	22,000,000
Oil and gas, purchased | Operating Segments | Altus Midstream
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Cost of oil and gas purchased	0	0
Oil and gas, purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Cost of oil and gas purchased	0	0
Oil
Other Income (Expense):
Revenues from non-customer	45,000,000	107,000,000
Oil | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil and gas production revenues	1,032,000,000	1,310,000,000
Oil | Oil and gas, excluding purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil and gas production revenues	333,000,000	514,000,000
Oil | Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil and gas production revenues	271,000,000	300,000,000
Oil | Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil and gas production revenues	428,000,000	496,000,000
Oil | Oil and gas, excluding purchased | Operating Segments | Altus Midstream
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Oil | Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Natural Gas
Other Income (Expense):
Revenues from non-customer	3,000,000	11,000,000
Natural Gas | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil and gas production revenues	123,000,000	236,000,000
Natural Gas | Oil and gas, excluding purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil and gas production revenues	65,000,000	81,000,000
Natural Gas | Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil and gas production revenues	19,000,000	32,000,000
Natural Gas | Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil and gas production revenues	39,000,000	123,000,000
Natural Gas | Oil and gas, excluding purchased | Operating Segments | Altus Midstream
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Natural Gas | Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Natural Gas liquids
Other Income (Expense):
Revenues from non-customer	0	1,000,000
Natural Gas liquids | Oil and gas, excluding purchased
Segment Reporting Information [Line Items]
Oil and gas production revenues	81,000,000	108,000,000
Natural Gas liquids | Oil and gas, excluding purchased | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil and gas production revenues	3,000,000	4,000,000
Natural Gas liquids | Oil and gas, excluding purchased | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil and gas production revenues	7,000,000	6,000,000
Natural Gas liquids | Oil and gas, excluding purchased | Operating Segments | U.S.
Segment Reporting Information [Line Items]
Oil and gas production revenues	71,000,000	98,000,000
Natural Gas liquids | Oil and gas, excluding purchased | Operating Segments | Altus Midstream
Segment Reporting Information [Line Items]
Oil and gas production revenues	0	0
Natural Gas liquids | Oil and gas, excluding purchased | Intersegment Eliminations & Other
Segment Reporting Information [Line Items]
Oil and gas production revenues	$ 0	$ 0