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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill by reporting unit for the nine months ended September 30, 2015 were as follows:

 

 

(stated in millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reservoir

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Characterization

 

 

Drilling

 

 

Production

 

 

Total

 

Balance at December 31, 2014

$

3,812

 

 

$

8,488

 

 

$

3,187

 

 

$

15,487

 

Acquisitions

 

23

 

 

 

126

 

 

 

30

 

 

 

179

 

Impact of changes in exchange rates

 

(23

)

 

 

(15

)

 

 

(18

)

 

 

(56

)

Balance at September 30, 2015

$

3,812

 

 

$

8,599

 

 

$

3,199

 

 

$

15,610