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Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Goodwill [Line Items]  
Goodwill, Beginning Balance $ 14,706
Acquisitions 138
Reallocation 0
Impact of changes in exchange rates and other (12)
Goodwill, Ending Balance 14,832
Reservoir Characterization
 
Goodwill [Line Items]  
Goodwill, Beginning Balance 3,737
Acquisitions 14
Reallocation 83
Impact of changes in exchange rates and other (5)
Goodwill, Ending Balance 3,829
Drilling
 
Goodwill [Line Items]  
Goodwill, Beginning Balance 8,315
Reallocation (83)
Impact of changes in exchange rates and other (3)
Goodwill, Ending Balance 8,229
Production
 
Goodwill [Line Items]  
Goodwill, Beginning Balance 2,654
Acquisitions 124
Impact of changes in exchange rates and other (4)
Goodwill, Ending Balance $ 2,774