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Revenue (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue [Abstract]  
Disaggregation of Revenue The following table presents information on our disaggregated revenue.

Millions of dollars
Three Months Ended
March 31
Revenue by segment:
2019
2018
Completion and Production
$
3,662

$
3,807

Drilling and Evaluation
2,075

1,933

Total revenue
$
5,737

$
5,740

Revenue by geographic region:
 
 
North America
$
3,275

$
3,517

Latin America
587

457

Europe/Africa/CIS
748

716

Middle East/Asia
1,127

1,050

Total revenue
$
5,737

$
5,740