Goodwill - Changes in Carrying Amount of Goodwill (Detail) $ in Millions	6 Months Ended
Jun. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 15,487
Acquisitions	60
Impact of changes in exchange rates	(22)
Goodwill, Ending Balance	15,525
Operating Segments \| Reservoir Characterization
Goodwill [Line Items]
Goodwill, Beginning Balance	3,812
Impact of changes in exchange rates	(9)
Goodwill, Ending Balance	3,803
Operating Segments \| Drilling
Goodwill [Line Items]
Goodwill, Beginning Balance	8,488
Acquisitions	30
Impact of changes in exchange rates	(6)
Goodwill, Ending Balance	8,512
Operating Segments \| Production
Goodwill [Line Items]
Goodwill, Beginning Balance	3,187
Acquisitions	30
Impact of changes in exchange rates	(7)
Goodwill, Ending Balance	$ 3,210

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

-Topic 350

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-Section 45

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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 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

-SubTopic 20

-Section 50

-Paragraph 1

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