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Business Segments - Other Items by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Total other items $ 1,078 $ 112 $ 1,336 $ 251
Operating Segments [Member] | Rig Systems [Member]        
Segment Reporting Information [Line Items]        
Total other items 994 22 1,069 65
Operating Segments [Member] | Rig Aftermarket [Member]        
Segment Reporting Information [Line Items]        
Total other items 3 1 16 11
Operating Segments [Member] | Wellbore Technologies [Member]        
Segment Reporting Information [Line Items]        
Total other items 24 29 112 83
Operating Segments [Member] | Completion & Production Solutions [Member]        
Segment Reporting Information [Line Items]        
Total other items 51 $ 60 123 $ 92
Eliminations and Corporate Costs [Member]        
Segment Reporting Information [Line Items]        
Total other items $ 6   $ 16