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Accounting For Suspended Exploratory Well Costs (Schedule Of Number Of Projects With Suspended Exploratory Well Costs) (Details)
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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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| Accounting For Suspended Exploratory Well Costs [Abstract] | |||
| Number of projects with first capitalized well drilled in the preceding 12 months | 4 | 9 | 18 |
| Number of projects that have exploratory well costs capitalized for a period of greater than 12 months | 58 | 59 | 57 |
| Total | 62 | 68 | 75 |