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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-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
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
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-Section 45
-Paragraph 5
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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 into (out 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.

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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	3 Months Ended	6 Months Ended	12 Months Ended
Goodwill - Additional Information (Detail) $ in Millions	Jun. 30, 2015 USD ($) Segment	Jun. 30, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Goodwill [Line Items]
Number of reporting units in Exploration and Production segment \| Segment	2
Goodwill			$ 375	$ 375	$ 1,858
Reclassification			0	0
Offshore Reporting Unit of Exploration and Production Segment
Goodwill [Line Items]
Goodwill	$ 1,098	$ 1,098
Onshore Reporting Unit of Exploration and Production Segment
Goodwill [Line Items]
Goodwill	$ 760	760
Bakken Midstream
Goodwill [Line Items]
Goodwill			375	375	$ 0
Reclassification		$ 375	$ 0	$ 375