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Business Segments - Other Items by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Total other items $ 17 $ 32 $ 139 $ 50
Operating Segments [Member] | Rig Systems [Member]        
Segment Reporting Information [Line Items]        
Total other items 3   43  
Operating Segments [Member] | Rig Aftermarket [Member]        
Segment Reporting Information [Line Items]        
Total other items 2   10  
Operating Segments [Member] | Wellbore Technologies [Member]        
Segment Reporting Information [Line Items]        
Total other items 9 6 54 9
Operating Segments [Member] | Completion & Production Solutions [Member]        
Segment Reporting Information [Line Items]        
Total other items $ 3 1 $ 32 7
Unallocated Expenses and Eliminations [Member]        
Segment Reporting Information [Line Items]        
Total other items   $ 25   $ 34