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Summary of Significant Accounting Policies - Goodwill Identified by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 6,980 $ 8,539
Goodwill acquired and adjusted during period 150  
Impairment (972) (1,485)
Currency translation adjustments and other (91) (74)
Goodwill, Ending Balance 6,067 6,980
Rig Systems [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 1,232 1,236
Impairment (972)  
Currency translation adjustments and other (2) (4)
Goodwill, Ending Balance 258 1,232
Rig Aftermarket [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 877 877
Goodwill, Ending Balance 877 877
Wellbore Technologies [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 2,874 4,357
Goodwill acquired and adjusted during period 24 8
Impairment   (1,485)
Currency translation adjustments and other (24) (6)
Goodwill, Ending Balance 2,874 2,874
Completion & Production Solutions [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 1,997 2,069
Goodwill acquired and adjusted during period 126 (8)
Currency translation adjustments and other (65) (64)
Goodwill, Ending Balance $ 2,058 $ 1,997