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Summary of Significant Accounting Policies - Goodwill is Identified by Segment (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]      
Goodwill, Beginning Balance $ 7,172 $ 6,151  
Goodwill acquired during period 1,903 1,000 377
Currency translation adjustments and other (26) 21  
Goodwill, Ending Balance 9,049 7,172 6,151
Discontinued Operations [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 343 52  
Goodwill acquired during period    291  
Currency translation adjustments and other (10)     
Goodwill, Ending Balance 333 343  
Rig Systems [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 1,097 943  
Goodwill acquired during period 179 145  
Currency translation adjustments and other 3 9  
Goodwill, Ending Balance 1,279 1,097  
Rig Aftermarket [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 649 556  
Goodwill acquired during period 256 89  
Currency translation adjustments and other 1 4  
Goodwill, Ending Balance 906 649  
Wellbore Technologies [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 3,769 3,683  
Goodwill acquired during period 665 80  
Currency translation adjustments and other (9) 6  
Goodwill, Ending Balance 4,425 3,769  
Completion & Production Solutions [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 1,314 917  
Goodwill acquired during period 803 395  
Currency translation adjustments and other (11) 2  
Goodwill, Ending Balance $ 2,106 $ 1,314