BUSINESS SEGMENT INFORMATION (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of reporting segments | Segment			3
Segment Reporting Information [Line Items]
Revenue from contract with customers	$ 1,936,000,000	$ 1,346,000,000	$ 3,669,000,000	$ 2,858,000,000
Operating Income (Loss)	738,000,000	180,000,000	1,325,000,000	545,000,000
Other Income (Expense):
Gain (loss) on divestitures	2,000,000	(21,000,000)	9,000,000	320,000,000
Other	(9,000,000)	59,000,000	(2,000,000)	84,000,000
General and administrative	(117,000,000)	(106,000,000)	(231,000,000)	(209,000,000)
Transaction, reorganization, and separation	(12,000,000)	(4,000,000)	(12,000,000)	6,000,000
Financing costs, net	(94,000,000)	(99,000,000)	(193,000,000)	(199,000,000)
NET INCOME BEFORE INCOME TAXES	508,000,000	9,000,000	896,000,000	547,000,000
Total Assets	21,910,000,000	22,602,000,000	21,910,000,000	22,602,000,000	$ 21,922,000,000
Revenue from non-customer	181,000,000		336,000,000
Asset impairments			0
Operating Segments | United States
Segment Reporting Information [Line Items]
Revenue from contract with customers	842,000,000	491,000,000	1,616,000,000	1,043,000,000
Operating Income (Loss)	192,000,000	(17,000,000)	376,000,000	43,000,000
Other Income (Expense):
Total Assets	14,250,000,000	12,530,000,000	14,250,000,000	12,530,000,000
Asset impairments	21,000,000	38,000,000	37,000,000	52,000,000
Operating Segments | Canada
Segment Reporting Information [Line Items]
Revenue from contract with customers	0	93,000,000	0	195,000,000
Operating Income (Loss)	0	(18,000,000)	0	(31,000,000)
Other Income (Expense):
Total Assets	0	1,476,000,000	0	1,476,000,000
Asset impairments		1,000,000		2,000,000
Operating Segments | Egypt
Segment Reporting Information [Line Items]
Revenue from contract with customers	742,000,000	521,000,000	1,402,000,000	1,112,000,000
Operating Income (Loss)	401,000,000	213,000,000	737,000,000	514,000,000
Other Income (Expense):
Total Assets	4,471,000,000	4,778,000,000	4,471,000,000	4,778,000,000
Operating Segments | North Sea
Segment Reporting Information [Line Items]
Revenue from contract with customers	352,000,000	241,000,000	651,000,000	508,000,000
Operating Income (Loss)	146,000,000	4,000,000	214,000,000	42,000,000
Other Income (Expense):
Total Assets	3,148,000,000	3,772,000,000	3,148,000,000	3,772,000,000
Asset impairments				8,000,000
Other International
Segment Reporting Information [Line Items]
Revenue from contract with customers	0	0	0	0
Operating Income (Loss)	(1,000,000)	(2,000,000)	(2,000,000)	(23,000,000)
Other Income (Expense):
Total Assets	41,000,000	46,000,000	41,000,000	46,000,000
Oil
Segment Reporting Information [Line Items]
Revenue from contract with customers	1,576,000,000	1,050,000,000	2,969,000,000	2,222,000,000
Other Income (Expense):
Revenue from non-customer	165,000,000		304,000,000
Oil | Operating Segments | United States
Segment Reporting Information [Line Items]
Revenue from contract with customers	607,000,000	355,000,000	1,160,000,000	752,000,000
Oil | Operating Segments | Canada
Segment Reporting Information [Line Items]
Revenue from contract with customers	0	47,000,000	0	96,000,000
Oil | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Revenue from contract with customers	649,000,000	423,000,000	1,218,000,000	909,000,000
Oil | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Revenue from contract with customers	320,000,000	225,000,000	591,000,000	465,000,000
Oil | Other International
Segment Reporting Information [Line Items]
Revenue from contract with customers	0	0	0	0
Natural Gas
Segment Reporting Information [Line Items]
Revenue from contract with customers	212,000,000	233,000,000	434,000,000	488,000,000
Other Income (Expense):
Revenue from non-customer	15,000,000		30,000,000
Natural Gas | Operating Segments | United States
Segment Reporting Information [Line Items]
Revenue from contract with customers	96,000,000	84,000,000	206,000,000	169,000,000
Natural Gas | Operating Segments | Canada
Segment Reporting Information [Line Items]
Revenue from contract with customers	0	40,000,000	0	85,000,000
Natural Gas | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Revenue from contract with customers	89,000,000	95,000,000	177,000,000	197,000,000
Natural Gas | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Revenue from contract with customers	27,000,000	14,000,000	51,000,000	37,000,000
Natural Gas | Other International
Segment Reporting Information [Line Items]
Revenue from contract with customers	0	0	0	0
Natural gas liquids
Segment Reporting Information [Line Items]
Revenue from contract with customers	148,000,000	63,000,000	266,000,000	148,000,000
Other Income (Expense):
Revenue from non-customer	1,000,000		2,000,000
Natural gas liquids | Operating Segments | United States
Segment Reporting Information [Line Items]
Revenue from contract with customers	139,000,000	52,000,000	250,000,000	122,000,000
Natural gas liquids | Operating Segments | Canada
Segment Reporting Information [Line Items]
Revenue from contract with customers	0	6,000,000	0	14,000,000
Natural gas liquids | Operating Segments | Egypt
Segment Reporting Information [Line Items]
Revenue from contract with customers	4,000,000	3,000,000	7,000,000	6,000,000
Natural gas liquids | Operating Segments | North Sea
Segment Reporting Information [Line Items]
Revenue from contract with customers	5,000,000	2,000,000	9,000,000	6,000,000
Natural gas liquids | Other International
Segment Reporting Information [Line Items]
Revenue from contract with customers	$ 0	$ 0	$ 0	$ 0