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Description of Company and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Goodwill
Changes in the carrying amount of goodwill are detailed below by reportable segment.
Millions of dollars
Completion and Production
Drilling and Evaluation
Total
Balance at December 31, 2013:
$
1,533

$
635

$
2,168

Current year acquisitions
77

79

156

Purchase price adjustments for previous acquisitions
(4
)
10

6

Balance at December 31, 2014:
$
1,606

$
724

$
2,330

Current year acquisitions
27

26

53

Purchase price adjustments for previous acquisitions
1

1

2

Allocation to assets held for sale
—

(276
)
(276
)
Balance at December 31, 2015:
$
1,634

$
475

$
2,109