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Business Segments - Business Segments (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Revenue $ 5,587 $ 4,863 $ 15,731 $ 13,919
Total Operating Profit 988 884 2,700 2,290
Percentage as of operating profit to revenue 17.70% 18.20% 17.20% 16.50%
Operating Segments [Member] | Rig Systems [Member]
        
Segment Reporting Information [Line Items]        
Revenue 2,659 2,061 7,287 6,053
Total Operating Profit 533 388 1,485 1,141
Percentage as of operating profit to revenue 20.00% 18.80% 20.40% 18.90%
Operating Segments [Member] | Rig Aftermarket [Member]
        
Segment Reporting Information [Line Items]        
Revenue 837 712 2,372 1,933
Total Operating Profit 229 202 637 533
Percentage as of operating profit to revenue 27.40% 28.40% 26.90% 27.60%
Operating Segments [Member] | Wellbore Technologies [Member]
        
Segment Reporting Information [Line Items]        
Revenue 1,469 1,395 4,193 3,840
Total Operating Profit 278 306 762 672
Percentage as of operating profit to revenue 18.90% 21.90% 18.20% 17.50%
Operating Segments [Member] | Completion & Production Solutions [Member]
        
Segment Reporting Information [Line Items]        
Revenue 1,191 1,095 3,320 3,154
Total Operating Profit 185 175 479 438
Percentage as of operating profit to revenue 15.50% 16.00% 14.40% 13.90%
Unallocated/Eliminations [Member]
        
Segment Reporting Information [Line Items]        
Revenue (569) (400) (1,441) (1,061)
Total Operating Profit $ (237) $ (187) $ (663) $ (494)