Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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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.

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Amount of transfers of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized among segments.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Goodwill - Additional Information (Detail) $ in Millions	5 Months Ended	12 Months Ended
Goodwill - Additional Information (Detail) $ in Millions	May. 30, 2015 Segment	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jan. 31, 2014	Dec. 31, 2013 USD ($)
Goodwill [Line Items]
Number of reporting units in Exploration and Production segment \| Segment	2
Goodwill		$ 375		$ 1,858		$ 1,869
Reclassification		0
Percentage of interest in WilcoHess acquired for preparation of its subsequent sale with retail business				56.00%	56.00%
Offshore Reporting Unit of Exploration and Production Segment
Goodwill [Line Items]
Goodwill			$ 1,098
Onshore Reporting Unit of Exploration and Production Segment
Goodwill [Line Items]
Goodwill			$ 760
Bakken Midstream
Goodwill [Line Items]
Goodwill		375		$ 0		$ 0
Reclassification		$ 375