BUSINESS SEGMENT INFORMATION (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of reporting segments | Segment	3
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	$ 1,728,000,000	$ 1,512,000,000
Operating Income (Loss)	587,000,000	365,000,000
Other Income (Expense):
Gain on divestitures, net	7,000,000	341,000,000
Other	7,000,000	25,000,000
General and administrative	(114,000,000)	(103,000,000)
Transaction, reorganization, and separation	0	10,000,000
Financing costs, net	(99,000,000)	(100,000,000)
NET INCOME BEFORE INCOME TAXES	388,000,000	538,000,000
Total Assets	21,791,000,000	22,610,000,000	$ 21,922,000,000
Revenue from non-customer	155,000,000
Asset impairments	0
Cost of purchased oil and gas	104,000,000
Operating Segments | United States
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	769,000,000	552,000,000
Operating Income (Loss)	184,000,000	60,000,000
Other Income (Expense):
Total Assets	13,927,000,000	12,361,000,000
Asset impairments	16,000,000	15,000,000
Operating Segments | Canada
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	0	102,000,000
Operating Income (Loss)	0	(13,000,000)
Other Income (Expense):
Total Assets	0	1,556,000,000
Asset impairments		8,000,000
Operating Segments | Egypt
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	660,000,000	591,000,000
Operating Income (Loss)	336,000,000	301,000,000
Other Income (Expense):
Total Assets	4,813,000,000	5,006,000,000
Operating Segments | North Sea
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	299,000,000	267,000,000
Operating Income (Loss)	68,000,000	38,000,000
Other Income (Expense):
Total Assets	3,009,000,000	3,634,000,000
Other International
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	0	0
Operating Income (Loss)	(1,000,000)	(21,000,000)
Other Income (Expense):
Total Assets	42,000,000	53,000,000
Oil
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	1,392,000,000	1,172,000,000
Other Income (Expense):
Revenue from non-customer	139,000,000
Oil | Operating Segments | United States
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	552,000,000	397,000,000
Oil | Operating Segments | Canada
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	0	49,000,000
Oil | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	569,000,000	486,000,000
Oil | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	271,000,000	240,000,000
Oil | Other International
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	0	0
Natural Gas
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	218,000,000	255,000,000
Other Income (Expense):
Revenue from non-customer	15,000,000
Natural Gas | Operating Segments | United States
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	106,000,000	85,000,000
Natural Gas | Operating Segments | Canada
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	0	45,000,000
Natural Gas | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	88,000,000	102,000,000
Natural Gas | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	24,000,000	23,000,000
Natural Gas | Other International
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	0	0
Natural gas liquids
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	118,000,000	85,000,000
Other Income (Expense):
Revenue from non-customer	1,000,000
Natural gas liquids | Operating Segments | United States
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	111,000,000	70,000,000
Natural gas liquids | Operating Segments | Canada
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	0	8,000,000
Natural gas liquids | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	3,000,000	3,000,000
Natural gas liquids | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	4,000,000	4,000,000
Natural gas liquids | Other International
Segment Reporting Information [Line Items]
Total Oil and Gas Production Revenues	$ 0	$ 0