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Business Segments - Business Segments (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Revenue $ 5,255 $ 4,680 $ 10,144 $ 9,056
Total Operating Profit 913 713 1,712 1,406
Percentage as of operating profit to revenue 17.40% 15.20% 16.90% 15.50%
Operating Segments [Member] | Rig Systems [Member]
        
Segment Reporting Information [Line Items]        
Revenue 2,372 2,081 4,628 3,992
Total Operating Profit 501 383 952 753
Percentage as of operating profit to revenue 21.10% 18.40% 20.60% 18.90%
Operating Segments [Member] | Rig Aftermarket [Member]
        
Segment Reporting Information [Line Items]        
Revenue 785 670 1,535 1,221
Total Operating Profit 217 189 408 331
Percentage as of operating profit to revenue 27.60% 28.20% 26.60% 27.10%
Operating Segments [Member] | Wellbore Technologies [Member]
        
Segment Reporting Information [Line Items]        
Revenue 1,446 1,222 2,724 2,445
Total Operating Profit 263 184 484 366
Percentage as of operating profit to revenue 18.20% 15.10% 17.80% 15.00%
Operating Segments [Member] | Completion & Production Solutions [Member]
        
Segment Reporting Information [Line Items]        
Revenue 1,127 1,057 2,129 2,059
Total Operating Profit 157 127 294 263
Percentage as of operating profit to revenue 13.90% 12.00% 13.80% 12.80%
Unallocated/Eliminations [Member]
        
Segment Reporting Information [Line Items]        
Revenue (475) (350) (872) (661)
Total Operating Profit $ (225) $ (170) $ (426) $ (307)