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Suspended Wells - Summary of Aging of Suspended Well Costs (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
Project
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Dec. 31, 2010
Project
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Dec. 31, 2009
Project
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Dec. 31, 2008
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| Aging Of Capitalized Exploratory Well Costs [Line Items] | ||||
| Exploratory well costs capitalized for a period of one year or less | $ 115 | $ 220 | $ 319 | |
| Exploratory well costs capitalized for a period greater than one year | 922 | 793 | 589 | |
| Ending balance | $ 1,037 | $ 1,013 | $ 908 | $ 660 |
| Number of projects that have exploratory well costs that have been capitalized for a period greater than one year | 40 | 40 | 34 |
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- Details
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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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- Definition
The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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