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Business Segment and Geographic Information (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Information on business segments
The following table presents information on our business segments.
 
Three Months Ended
June 30
Six Months Ended
June 30
Millions of dollars
2017
2016
2017
2016
Revenue:
 
 
 
 
Completion and Production
$
3,132

$
2,114

$
5,736

$
4,438

Drilling and Evaluation
1,825

1,721

3,500

3,595

Total revenue
$
4,957

$
3,835

$
9,236

$
8,033

Operating income (loss):
 
 
 
 
Completion and Production
$
397

$
(32
)
$
544

$
(2
)
Drilling and Evaluation
125

154

247

395

Total operations
522

122

791

393

Corporate and other (a)
(114
)
(3,579
)
(180
)
(4,163
)
Impairments and other charges
(262
)
(423
)
(262
)
(3,189
)
Total operating income (loss)
$
146

$
(3,880
)
$
349

$
(6,959
)
Interest expense, net of interest income
(121
)
(196
)
(363
)
(361
)
Other, net
(26
)
(31
)
(44
)
(78
)
Loss from continuing operations before income taxes
$
(1
)
$
(4,107
)
$
(58
)
$
(7,398
)

(a) Includes certain expenses not attributable to a particular business segment such as costs related to support functions and corporate executives, as well as merger-related costs and termination fee incurred during the three and six months ended June 30, 2016.