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Summary of Significant Accounting Policies - Identified Intangible Assets Identified by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance $ 3,530 $ 3,849
Additions to intangible assets 61 24
Amortization (339) (333)
Currency translation adjustments 49 (10)
Ending Balance 3,301 3,530
Wellbore Technologies [Member]    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 2,064 2,254
Additions to intangible assets 18 15
Amortization (208) (205)
Currency translation adjustments 9  
Ending Balance 1,883 2,064
Completion & Production Solutions [Member]    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 1,191 1,296
Additions to intangible assets 41 9
Amortization (108) (106)
Currency translation adjustments 36 (8)
Ending Balance 1,160 1,191
Rig Technologies [Member]    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 275 299
Additions to intangible assets 2  
Amortization (23) (22)
Currency translation adjustments 4 (2)
Ending Balance $ 258 $ 275