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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
Rig Technology [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 2,386 1,959  
Goodwill acquired during period 262 412  
Currency translation adjustments and other (5) 15  
Goodwill, Ending Balance 2,643 2,386  
Petroleum Services & Supplies [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 4,333 4,089  
Goodwill acquired during period 1,363 241  
Currency translation adjustments and other (13) 3  
Goodwill, Ending Balance 5,683 4,333  
Distribution & Transmission [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 453 103  
Goodwill acquired during period 278 347  
Currency translation adjustments and other (8) 3  
Goodwill, Ending Balance $ 723 $ 453