Goodwill - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 15,487	$ 14,706
Acquisitions	244	837
Impact of changes in exchange rates	(126)	(56)
Goodwill, Ending Balance	15,605	15,487
Operating Segments \| Reservoir Characterization
Goodwill [Line Items]
Goodwill, Beginning Balance	3,812	3,737
Acquisitions	38	15
Reallocation		83
Impact of changes in exchange rates	(52)	(23)
Goodwill, Ending Balance	3,798	3,812
Operating Segments \| Drilling
Goodwill [Line Items]
Goodwill, Beginning Balance	8,488	8,315
Acquisitions	130	271
Reallocation		(83)
Impact of changes in exchange rates	(34)	(15)
Goodwill, Ending Balance	8,584	8,488
Operating Segments \| Production
Goodwill [Line Items]
Goodwill, Beginning Balance	3,187	2,654
Acquisitions	76	551
Impact of changes in exchange rates	(40)	(18)
Goodwill, Ending Balance	$ 3,223	$ 3,187

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
-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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

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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
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