Description of Company and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Goodwill

The 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, 2010:	$	767	$	548	$	1,315
Current year acquisitions	411		13		424
Purchase price adjustments for previous acquisitions	37		—		37
Balance at December 31, 2011:	$	1,215	$	561	$	1,776
Current year acquisitions	100		62		162
Purchase price adjustments for previous acquisitions	196		1		197
Balance at December 31, 2012:	$	1,511	$	624	$	2,135