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Business Segment and Geographic Information (Tables)
 9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Information on business segments The following table presents information on our business segments.
 
Three Months Ended
September 30
Nine Months Ended
September 30
Millions of dollars
2018
2017
2018
2017
Revenue:
 
 
 
 
Completion and Production
$
4,170

$
3,537

$
12,141

$
9,273

Drilling and Evaluation
2,002

1,907

5,918

5,407

Total revenue
$
6,172

$
5,444

$
18,059

$
14,680

Operating income:
 
 
 
 
Completion and Production
$
613

$
527

$
1,782

$
1,071

Drilling and Evaluation
181

186

560

433

Total operations
794

713

2,342

1,504

Corporate and other (a)
(78
)
(71
)
(218
)
(251
)
Impairments and other charges (b)
—

—

(265
)
(262
)
Total operating income
$
716

$
642

$
1,859

$
991

Interest expense, net of interest income (c)
(140
)
(115
)
(417
)
(478
)
Other, net
(42
)
(31
)
(86
)
(75
)
Income from continuing operations before income taxes
$
534

$
496

$
1,356

$
438


(a) Corporate and other includes certain expenses not attributable to a particular business segment, such as costs related to support functions and corporate executives, and amortization expense associated with intangible assets recorded as a result of acquisitions.
(b) Represents a pre-tax charge of $265 million related to a write-down of all of our remaining investment in Venezuela, consisting of receivables, fixed assets, inventory and other assets and liabilities during the nine months ended September 30, 2018 and $262 million for a fair market value adjustment related to Venezuela during the nine months ended September 30, 2017.
(c) Includes $104 million of costs related to the early extinguishment of $1.4 billion of senior notes in the nine months ended September 30, 2017.