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Business Segment and Geographic Information (Tables)
 6 Months Ended
Jun. 30, 2019
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
2019
2018
2019
2018
Revenue:
 
 
 
 
Completion and Production
$
3,805

$
4,164

$
7,467

$
7,971

Drilling and Evaluation
2,125

1,983

4,200

3,916

Total revenue
$
5,930

$
6,147

$
11,667

$
11,887

Operating income:
 
 
 
 
Completion and Production
$
470

$
669

$
838

$
1,169

Drilling and Evaluation
145

191

268

379

Total operations
615

860

1,106

1,548

Corporate and other (a)
(65
)
(71
)
(130
)
(140
)
Impairments and other charges (b)
(247
)
—

(308
)
(265
)
Total operating income
$
303

$
789

$
668

$
1,143

Interest expense, net of interest income
(144
)
(137
)
(287
)
(277
)
Other, net
(8
)
(19
)
(38
)
(44
)
Income before income taxes
$
151

$
633

$
343

$
822


(a) Corporate and other includes certain expenses not attributable to a particular business segment, such as costs related to support functions and corporate executives.
(b) For the three months ended June 30, 2019, amount includes $77 million attributable to Completion and Production, $142 million attributable to Drilling and Evaluation, and $28 million attributable to Corporate and other. For the six months ended June 30, 2019, amount includes $127 million attributable to Completion and Production, $153 million attributable to Drilling and Evaluation, and $28 million attributable to Corporate and other. During the six months ended June 30, 2018, we recognized a pre-tax charge of $265 million related to a write-down of all of our remaining investment in Venezuela. See Note 2 for further discussion on these impairments and other charges. There were no such impairments and other charges recorded during the three months ended June 30, 2018.