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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, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 6,151 $ 5,790
Goodwill acquired during period 1,000 377
Currency translation adjustments and other 21 (16)
Goodwill, Ending Balance 7,172 6,151
Rig Technology [Member]
    
Goodwill [Line Items]    
Goodwill, Beginning Balance 1,959 1,854
Goodwill acquired during period 412 117
Currency translation adjustments and other 15 (12)
Goodwill, Ending Balance 2,386 1,959
Petroleum Services & Supplies [Member]
    
Goodwill [Line Items]    
Goodwill, Beginning Balance 4,089 3,859
Goodwill acquired during period 241 233
Currency translation adjustments and other 3 (3)
Goodwill, Ending Balance 4,333 4,089
Distribution & Transmission [Member]
    
Goodwill [Line Items]    
Goodwill, Beginning Balance 103 77
Goodwill acquired during period 347 27
Currency translation adjustments and other 3 (1)
Goodwill, Ending Balance $ 453 $ 103