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Suspended Wells - Summary of Net Changes in Suspended Exploratory Well Costs (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] | |||
| Beginning balance | $ 1,013 | $ 908 | $ 660 |
| Additions pending the determination of proved reserves | 96 | 216 | 342 |
| Reclassifications to proved properties | (72) | (106) | (39) |
| Sales of suspended well investment | (4) | (21) | |
| Charged to dry hole expense | (1) | (34) | |
| Ending balance | $ 1,037 | $ 1,013 | $ 908 |
| X | ||||||||||
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- Definition
Capitalized exploratory well cost, sales of suspended well investment. No definition available.
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| X | ||||||||||
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- Definition
Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Capitalized exploratory well costs that were expensed during the year because proved reserves were not found at the exploratory well. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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