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| <Label Id="1" Label="12 Months Ended"/> |
| <Label Id="2" Label="Dec. 31, 2009"/> |
| <Label Id="4" Label="USD / shares"/> |
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| <MeasureValue> USD </MeasureValue> |
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| <Unit> |
| <UnitID> u001 </UnitID> |
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| <MeasureSchema> http://www.xbrl.org/2003/instance </MeasureSchema> |
| <MeasureValue> shares </MeasureValue> |
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| <MeasureSchema> http://www.xbrl.org/2003/instance </MeasureSchema> |
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| | | <Label> Notes to Financial Statements [Abstract] </Label> |
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| | | <Id> 3 </Id> |
| | | <Label> Note 4. Inventories </Label> |
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| <NonNumbericText> Note 4. InventoriesInventories are stated at the lower of cost or market. In the United States we manufacture certain finished products and parts inventories for drill bits, completion products, bulk materials, and other tools that are recorded using the last-in, first-out method, which totaled $68 million at December 31, 2009 and $92 million at December 31, 2008. If the average cost method had been used, total inventories would have been $33 million higher than reported at December 31, 2009 and $31 million higher than reported at December 31, 2008. The cost of the remaining inventory was recorded on the average cost method. Inventories consisted of the following: December 31 Millions of dollars 2009 2008 Finished products and parts $ 1,090 $ 1,312Raw materials and supplies 480 446Work in process 28 70Total $ 1,598 $ 1,828 Finished products and parts are reported net of obsolescence reserves of $94 million at December 31, 2009 and $81 million at December 31, 2008. </NonNumbericText> |
| <NonNumericTextHeader> Note 4. InventoriesInventories are stated at the lower of cost or market. In the United States we manufacture certain finished products and parts inventories </NonNumericTextHeader> |
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| <MonetaryRoundingLevel> UnKnown </MonetaryRoundingLevel> |
| <SharesRoundingLevel> UnKnown </SharesRoundingLevel> |
| <PerShareRoundingLevel> UnKnown </PerShareRoundingLevel> |
| <HasPureData> false </HasPureData> |
| <SharesShouldBeRounded> true </SharesShouldBeRounded> |
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