BUSINESS SEGMENT INFORMATION - Financial Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Oil and Gas Production Revenues	$ 1,389	$ 1,439	$ 4,247	$ 3,912
Operating Income (Loss)	126	(688)	671	(914)
Other Income (Expense):
Gain on divestitures	296	5	616	21
Derivative instrument losses, net	(110)	0	(69)	0
Other		(6)	43	(30)
General and administrative	(98)	(102)	(307)	(298)
Transaction, reorganization, and separation	(20)	(12)	(14)	(36)
Financing costs, net	(101)	(102)	(300)	(311)
NET INCOME (LOSS) BEFORE INCOME TAXES	93	(905)	640	(1,568)
Total Assets	21,835	23,149	21,835	23,149	$ 22,519
Operating Segments | United States
Segment Reporting Information [Line Items]
Oil and Gas Production Revenues	550	524	1,593	1,453
Operating Income (Loss)	(114)	(17)	(71)	(283)
Other Income (Expense):
Total Assets	13,105	12,299	13,105	12,299
Asset impairments	160	46	212	212
Operating Segments | Canada
Segment Reporting Information [Line Items]
Oil and Gas Production Revenues	36	87	231	243
Operating Income (Loss)	(1)	(466)	(33)	(586)
Other Income (Expense):
Total Assets	0	1,630	0	1,630
Asset impairments		423	2	433
Operating Segments | Egypt
Segment Reporting Information [Line Items]
Oil and Gas Production Revenues	543	581	1,655	1,515
Operating Income (Loss)	226	263	740	525
Other Income (Expense):
Total Assets	4,906	5,320	4,906	5,320
Operating Segments | North Sea
Segment Reporting Information [Line Items]
Oil and Gas Production Revenues	260	247	768	701
Operating Income (Loss)	16	(455)	59	(557)
Other Income (Expense):
Total Assets	3,770	3,851	3,770	3,851
Asset impairments		481	8	586
Other International
Segment Reporting Information [Line Items]
Oil and Gas Production Revenues	0	0	0	0
Operating Income (Loss)	(1)	(13)	(24)	(13)
Other Income (Expense):
Total Assets	$ 54	$ 49	$ 54	$ 49