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Summary of Significant Accounting Policies - Identified Intangible Assets Identified by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance $ 4,444 $ 5,055
Additions to intangible assets 59 59
Disposal of intangible assets   (117)
Asset impairment (204) (104)
Amortization (356) (366)
Currency translation adjustments and other (94) (83)
Ending Balance 3,849 4,444
Discontinued Operations [Member]    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance   68
Disposal of intangible assets   (67)
Amortization   (1)
Rig Systems [Member]    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 208 232
Asset impairment (7)  
Amortization (22) (22)
Currency translation adjustments and other (3) (2)
Ending Balance 176 208
Rig Aftermarket [Member]    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 133 142
Amortization (6) (6)
Currency translation adjustments and other (4) (3)
Ending Balance 123 133
Wellbore Technologies [Member]    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 2,666 2,999
Additions to intangible assets 2 5
Asset impairment (173) (104)
Amortization (214) (218)
Currency translation adjustments and other (27) (16)
Ending Balance 2,254 2,666
Completion & Production Solutions [Member]    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 1,437 1,614
Additions to intangible assets 57 54
Disposal of intangible assets   (50)
Asset impairment (24)  
Amortization (114) (119)
Currency translation adjustments and other (60) (62)
Ending Balance $ 1,296 $ 1,437