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Derivative and Financial Instruments - Commodity Notional (Details 2)
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Sep. 30, 2012
MMBbls
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Dec. 31, 2011
MMBbls
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|---|---|---|
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Crude oil, refined products and natural gas liquids [Member]
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| Trading Activity, Gains and Losses, Net [Line Items] | ||
| Commodity derivatives - material net exposures | 0 | (13) |
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Natural gas and power, Fixed price [Member]
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| Trading Activity, Gains and Losses, Net [Line Items] | ||
| Commodity derivatives - material net exposures | (64,000,000,000) | (57,000,000,000) |
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Natural gas and power, Basis [Member]
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| Trading Activity, Gains and Losses, Net [Line Items] | ||
| Commodity derivatives - material net exposures | 97,000,000,000 | (25,000,000,000) |