SUPPLEMENTAL OIL AND GAS DISCLOSURES (Unaudited) - Costs Incurred in Oil and Gas Property Acquisitions, Exploration and Development Activities (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved	$ 7	$ 45	$ 38
Unproved	181	170	336
Exploration	891	470	677
Development	1,807	950	3,198
Costs incurred	2,886	1,635	4,249
Capitalized interest	44	48	21
Asset retirement costs	70	(192)	65
United States
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved	3	0	1
Unproved	136	110	313
Exploration	602	278	194
Development	1,118	420	1,729
Costs incurred	1,859	808	2,237
Capitalized interest	23	21	0
Asset retirement costs	15	(51)	123
Canada
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved	0	1	8
Unproved	5	7	23
Exploration	11	23	51
Development	52	27	151
Costs incurred	68	58	233
Capitalized interest	2	6	0
Asset retirement costs	0	(13)	8
Egypt
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved	4	6	29
Unproved	40	49	0
Exploration	122	67	125
Development	387	353	741
Costs incurred	553	475	895
Capitalized interest	0	0	8
Asset retirement costs	0	0	0
Australia
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved	0	0	0
Unproved	0	0	0
Exploration	0	0	32
Development	0	0	98
Costs incurred	0	0	130
Capitalized interest	0	0	6
Asset retirement costs	0	0	0
North Sea
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved	0	38	0
Unproved	0	4	0
Exploration	131	84	246
Development	250	150	479
Costs incurred	381	276	725
Capitalized interest	17	21	7
Asset retirement costs	55	(128)	(66)
Other International
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proved	0	0	0
Unproved	0	0	0
Exploration	25	18	29
Development	0	0	0
Costs incurred	25	18	29
Capitalized interest	2	0	0
Asset retirement costs	$ 0	$ 0	$ 0

Costs or benefits incurred acquisition of unproved oil and gas properties.

No definition available.

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- Definition

Costs or Benefits Incurred Asset Retirement Obligation Incurred

+ References

No definition available.

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- Definition

Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties.

+ References

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- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 18
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62038-109447

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- Definition

Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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- Definition

Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

+ References

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- Definition

Amount of interest capitalized, including amount of allowance for funds used during construction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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