Goodwill - Changes in Carrying Amount of Goodwill (Detail) $ in Millions	6 Months Ended
Jun. 30, 2016 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 15,605
Acquisition of Cameron	8,837
Other acquisitions	129
Impact of changes in exchange rates	32
Goodwill, Ending Balance	24,603
Cameron
Goodwill [Line Items]
Acquisition of Cameron	5,387
Goodwill, Ending Balance	5,387
Operating Segments \| Reservoir Characterization
Goodwill [Line Items]
Goodwill, Beginning Balance	3,798
Acquisition of Cameron	790
Impact of changes in exchange rates	13
Goodwill, Ending Balance	4,601
Operating Segments \| Drilling
Goodwill [Line Items]
Goodwill, Beginning Balance	8,584
Acquisition of Cameron	1,490
Other acquisitions	24
Impact of changes in exchange rates	7
Goodwill, Ending Balance	10,105
Operating Segments \| Production
Goodwill [Line Items]
Goodwill, Beginning Balance	3,223
Acquisition of Cameron	1,170
Other acquisitions	105
Impact of changes in exchange rates	12
Goodwill, Ending Balance	$ 4,510

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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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments 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
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-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 25
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-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

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-Name Accounting Standards Codification
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