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Business Segment and Geographic Information (Tables)
 9 Months Ended
Sep. 30, 2012
Segment Reporting [Abstract]  
Information on business segments
 
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
Millions of dollars
 
2012
 
2011
 
2012
 
2011
Revenue:
 
 
 
 
 
 
 
 
Completion and Production
 
$
4,293

 
$
4,025

 
$
13,043

 
$
10,815

Drilling and Evaluation
 
2,818

 
2,523

 
8,170

 
6,950

Total revenue
 
$
7,111

 
$
6,548

 
$
21,213

 
$
17,765

Operating income:
 
 
 
 
 
 
 
 
Completion and Production
 
$
591

 
$
1,068

 
$
2,541

 
$
2,646

Drilling and Evaluation
 
430

 
369

 
1,191

 
923

Total operations
 
1,021

 
1,437

 
3,732

 
3,569

Corporate and other
 
(67
)
 
(105
)
 
(554
)
 
(262
)
Total operating income
 
$
954

 
$
1,332

 
$
3,178

 
$
3,307

Interest expense, net of interest income
 
(71
)
 
(62
)
 
(225
)
 
(194
)
Other, net
 
(6
)
 
(9
)
 
(30
)
 
(18
)
Income from continuing operations before income taxes
 
$
877

 
$
1,261

 
$
2,923

 
$
3,095