| Schedule of Segment Reporting Information, by Segment [Table] |
| | | Three Months Ended | | | Six Months Ended | | | | | June 30 | | | June 30 | | Millions of dollars | | 2011 | | | 2010 | | | 2011 | | | 2010 | | Revenue: | | | | | | | | | | | | | Completion and Production | | $ | 3,618 | | | $ | 2,393 | | | $ | 6,790 | | | $ | 4,357 | | Drilling and Evaluation | | | 2,317 | | | | 1,994 | | | | 4,427 | | | | 3,791 | | Total revenue | | $ | 5,935 | | | $ | 4,387 | | | $ | 11,217 | | | $ | 8,148 | | | | | | | | | | | | | | | | | | | | Operating income: | | | | | | | | | | | | | | | | | Completion and Production | | $ | 918 | | | $ | 497 | | | $ | 1,578 | | | $ | 735 | | Drilling and Evaluation | | | 324 | | | | 318 | | | | 554 | | | | 588 | | Total operations | | | 1,242 | | | | 815 | | | | 2,132 | | | | 1,323 | | Corporate and other | | | (81 | ) | | | (53 | ) | | | (157 | ) | | | (112 | ) | Total operating income | | $ | 1,161 | | | $ | 762 | | | $ | 1,975 | | | $ | 1,211 | | Interest expense, net of interest income | | | (63 | ) | | | (76 | ) | | | (132 | ) | | | (152 | ) | Other, net | | | (5 | ) | | | (9 | ) | | | (9 | ) | | | (49 | ) | Income from continuing operations before | | | | | | | | | | | | | | | | | income taxes | | $ | 1,093 | | | $ | 677 | | | $ | 1,834 | | | $ | 1,010 | |
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