Business Segment and Geographic Information
9 Months Ended
Sep. 30, 2011
Business Segment and Geographic Information [Abstract] 
Business Segment and Geographic Information
Note 2. Business Segment and Geographic Information
We operate under two divisions, which form the basis for the two operating segments we report: the Completion and Production segment and the Drilling and Evaluation segment.
The following table presents information on our business segments. "Corporate and other" includes expenses related to support functions and corporate executives. Also included are certain gains and losses not attributable to a particular business segment.
Intersegment revenue was immaterial. Our equity in earnings and losses of unconsolidated affiliates that are accounted for by the equity method of accounting are included in revenue and operating income of the applicable segment.

   
Three Months Ended
  
Nine Months Ended
 
   
September 30
  
September 30
 
Millions of dollars
 
2011
  
2010
  
2011
  
2010
 
Revenue:
            
Completion and Production
 $4,025  $2,655  $10,815  $7,012 
Drilling and Evaluation
  2,523   2,010   6,950   5,801 
Total revenue
 $6,548  $4,665  $17,765  $12,813 
                  
Operating income:
                
Completion and Production
 $1,068  $609  $2,646  $1,344 
Drilling and Evaluation
  369   271   923   859 
Total operations
  1,437   880   3,569   2,203 
Corporate and other
  (105)  (62)  (262)  (174)
Total operating income
 $1,332  $818  $3,307  $2,029 
Interest expense, net of interest income
  (62)  (76)  (194)  (228)
Other, net
  (9)  (7)  (18)  (56)
Income from continuing operations before
                
income taxes
 $1,261  $735  $3,095  $1,745 

Receivables
As of September 30, 2011, 46% of our gross trade receivables were from customers in the United States. As of December 31, 2010, 36% of our gross trade receivables were from customers in the United States.