BUSINESS SEGMENT INFORMATION - Financial Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Oil and gas production revenues									$ 5,887	$ 5,367	$ 6,510
Operating Expenses:
Lease operating expenses									1,400	1,494	1,854
Gathering and transportation									179	200	211
Taxes other than income									151	126	282
Depreciation, depletion, and amortization									2,280	2,618	3,300
Exploration									549	473	2,771
Asset retirement obligation accretion									130	156	145
Impairments									8	1,103	9,472
Operating Income (Loss)									1,190	(803)	(11,525)
Other Income (Expense):
Gain on divestiture	$ 11	$ 296	$ (21)	$ 341	$ 0	$ 5	$ 17	$ (1)	627	21	281
Derivative instrument gains (losses), net									(135)	0	0
Other									44	(34)	98
General and administrative									(395)	(410)	(380)
Transaction, reorganization, and separation									(16)	(39)	(132)
Financing costs, net									(397)	(417)	(511)
NET INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									918	(1,682)	(12,169)
Net Property and Equipment	17,759				18,867				17,759	18,867	20,838
Total Assets	21,922				22,519				21,922	22,519	25,500
Additions to Net Property and Equipment	3,302				1,681				3,302	1,681	4,106
Operating Segments | United States
Segment Reporting Information [Line Items]
Oil and gas production revenues									2,271	1,997	2,637
Operating Expenses:
Lease operating expenses									600	553	739
Gathering and transportation									71	80	68
Taxes other than income									153	139	184
Depreciation, depletion, and amortization									1,000	1,138	1,558
Exploration									363	285	2,145
Asset retirement obligation accretion									31	34	28
Impairments									0	80	6,266
Operating Income (Loss)									53	(312)	(8,351)
Other Income (Expense):
Net Property and Equipment	12,070				11,168				12,070	11,168	11,753
Total Assets	14,228				12,403				14,228	12,403	12,782
Additions to Net Property and Equipment	2,397				926				2,397	926	2,099
Operating Segments | Canada
Segment Reporting Information [Line Items]
Oil and gas production revenues									231	343	498
Operating Expenses:
Lease operating expenses									103	181	244
Gathering and transportation									34	68	89
Taxes other than income									12	20	26
Depreciation, depletion, and amortization									76	183	301
Exploration									11	88	231
Asset retirement obligation accretion									27	47	43
Impairments									0	367	1,593
Operating Income (Loss)									(32)	(611)	(2,029)
Other Income (Expense):
Net Property and Equipment	0				1,464				0	1,464	2,074
Total Assets	0				1,591				0	1,591	2,225
Additions to Net Property and Equipment	0				34				0	34	403
Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil and gas production revenues									2,307	2,057	2,095
Operating Expenses:
Lease operating expenses									362	446	522
Gathering and transportation									44	44	45
Taxes other than income									0	0	9
Depreciation, depletion, and amortization									758	778	927
Exploration									62	48	154
Asset retirement obligation accretion									0	0	0
Impairments									0	1	1,255
Operating Income (Loss)									1,081	740	(817)
Other Income (Expense):
Net Property and Equipment	3,099				3,362				3,099	3,362	3,712
Total Assets	4,658				4,893				4,658	4,893	6,165
Additions to Net Property and Equipment	517				459				517	459	862
Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil and gas production revenues									1,078	970	1,280
Operating Expenses:
Lease operating expenses									335	314	349
Gathering and transportation									30	8	9
Taxes other than income									(14)	(33)	63
Depreciation, depletion, and amortization									446	519	514
Exploration									86	37	237
Asset retirement obligation accretion									72	75	74
Impairments									8	655	211
Operating Income (Loss)									115	(605)	(177)
Other Income (Expense):
Net Property and Equipment	2,553				2,834				2,553	2,834	3,263
Total Assets	2,977				3,584				2,977	3,584	4,280
Additions to Net Property and Equipment	374				260				374	260	715
Other International
Segment Reporting Information [Line Items]
Oil and gas production revenues									0	0	0
Operating Expenses:
Lease operating expenses									0	0	0
Gathering and transportation									0	0	0
Taxes other than income									0	0	0
Depreciation, depletion, and amortization									0	0	0
Exploration									27	15	4
Asset retirement obligation accretion									0	0	0
Impairments									0	0	147
Operating Income (Loss)									(27)	(15)	(151)
Other Income (Expense):
Net Property and Equipment	37				39				37	39	36
Total Assets	59				48				59	48	48
Additions to Net Property and Equipment	$ 14				$ 2				$ 14	$ 2	$ 27