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Oil and Gas Exploration and Production Industries Disclosures, Average Sales Price (Details)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Average Sales Price and Production Costs Per Unit of Production [Line Items] | |||
| Production costs per barrel of oil equivalent | 5.85 | 6.03 | 4.85 |
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United States [Member]
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| Average Sales Price and Production Costs Per Unit of Production [Line Items] | |||
| Production costs per barrel of oil equivalent | 5.96 | 6.19 | 5.00 |
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Canada [Member]
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| Average Sales Price and Production Costs Per Unit of Production [Line Items] | |||
| Production costs per barrel of oil equivalent | 16.42 | 14.26 | 10.28 |
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Trinidad [Member]
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| Average Sales Price and Production Costs Per Unit of Production [Line Items] | |||
| Production costs per barrel of oil equivalent | 0.98 | 0.78 | 0.65 |
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Other International [Member]
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| Average Sales Price and Production Costs Per Unit of Production [Line Items] | |||
| Production costs per barrel of oil equivalent | 18.97 | 13.82 | 9.34 |