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Summary of Significant Accounting Policies - Goodwill is Identified by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]      
Goodwill, Beginning Balance   $ 8,539 $ 9,049
Goodwill acquired and adjusted during period     167
Goodwill disposed of during the period     (403)
Impairment   (1,485)  
Currency translation adjustments and other   (74) (274)
Goodwill, Ending Balance $ 6,980 6,980 8,539
Discontinued Operations [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance     333
Goodwill disposed of during the period     (332)
Currency translation adjustments and other     (1)
Rig Systems [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance   1,236 1,279
Currency translation adjustments and other   (4) (43)
Goodwill, Ending Balance 1,232 1,232 1,236
Rig Aftermarket [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance   877 906
Currency translation adjustments and other     (29)
Goodwill, Ending Balance 877 877 877
Wellbore Technologies [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance   4,357 4,425
Goodwill acquired and adjusted during period   8 17
Impairment (1,485) (1,485)  
Currency translation adjustments and other   (6) (85)
Goodwill, Ending Balance 2,874 2,874 4,357
Completion & Production Solutions [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance   2,069 2,106
Goodwill acquired and adjusted during period   (8) 150
Goodwill disposed of during the period     (71)
Currency translation adjustments and other   (64) (116)
Goodwill, Ending Balance $ 1,997 $ 1,997 $ 2,069