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Goodwill
 6 Months Ended
Jun. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
Goodwill

8. Goodwill

The changes in the carrying amount of goodwill by reporting unit for the six months ended June 30, 2013 were as follows:

 

                       (Stated in millions)  
     Reservoir
Characterization		     Drilling     Production     Total  

Balance at December 31, 2012

    $ 3,760      $ 8,337      $ 2,488      $ 14,585   

Acquisitions

      3        3        44        50   

Divestiture of business

      —          —          (150 )      (150 ) 

Impact of changes in exchange rates

      (28 )      (26 )      (24 )      (78 ) 
  

 

 

    

 

 

    

 

 

    

 

 

  

Balance at June 30, 2013

    $ 3,735      $ 8,314      $ 2,358      $ 14,407