Goodwill - Changes in Carrying Amount of Goodwill (Detail) $ in Millions	9 Months Ended
Sep. 30, 2016 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 15,605
Acquisition of Cameron	9,196
Other acquisitions	129
Impact of changes in exchange rates	27
Goodwill, Ending Balance	24,957
Cameron
Goodwill [Line Items]
Acquisition of Cameron	5,746
Reallocation	(146)
Goodwill, Ending Balance	5,600
Operating Segments \| Reservoir Characterization
Goodwill [Line Items]
Goodwill, Beginning Balance	3,798
Acquisition of Cameron	790
Reallocation	146
Impact of changes in exchange rates	9
Goodwill, Ending Balance	4,743
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	13
Goodwill, Ending Balance	10,111
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	5
Goodwill, Ending Balance	$ 4,503

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.

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-Publisher FASB
-Name Accounting Standards Codification
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