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Description of Company and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2015: | $ | 1,634 |  | $ | 751 |  | $ | 2,385 |
Current year acquisitions | 31 |  | — |  | 31 |
Purchase price adjustments for previous acquisitions | (2 | ) | — |  | (2 | )
Other | 16 |  | (16 | ) | — |
Balance at December 31, 2016: | $ | 1,679 |  | $ | 735 |  | $ | 2,414 |
Current year acquisitions | 249 |  | 36 |  | 285 |
Purchase price adjustments for previous acquisitions | (6 | ) | — |  | (6 | )
Balance at December 31, 2017: | $ | 1,922 |  | $ | 771 |  | $ | 2,693 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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