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套期保值活动 (Schedule Of Derivative Instruments) (Details)
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12月. 31, 2012
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7月. 31, 2012
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2月. 29, 2012
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12月. 31, 2011
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12月. 31, 2010
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2月. 28, 2010
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| 衍生品〔单行项目〕 | ||||||
| 日交易量（桶/天） | 4,000 | 3,000 | 2,000 | 2,000 | 2,300 | 3,000 |
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Fixed Price Swap, Period of January 2013 through 12月ember 2013 [Member]
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| 衍生品〔单行项目〕 | ||||||
| 日交易量（桶/天） | 5,000 | |||||
| 加权平均价格（美元/桶） | 100.90 |
| X | ||||||||||
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——定义
Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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——细节
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| X |