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Derivative Financial Instruments (Schedule Of Volumes Of Open Commodity Derivative Positions) (Details)
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Mar. 31, 2014
contract
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Futures [Member] | Exchange Traded Net Long & Short [Member] | Corn, Soybeans And Wheat In Bushels [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | (5,345,000) | [1] | ||||||||
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Futures [Member] | Exchange Traded Net Long & Short [Member] | Corn In Bushels [Member] | Cash Flow Hedges [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 63,950,000 | [1],[2] | ||||||||
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Futures [Member] | Exchange Traded Net Long & Short [Member] | Corn In Bushels [Member] | Fair Value Hedging [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | (3,315,000) | [1],[3] | ||||||||
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Futures [Member] | Exchange Traded Net Long & Short [Member] | Ethanol In Gallons [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 54,684,000 | [1] | ||||||||
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Futures [Member] | Exchange Traded Net Long & Short [Member] | Ethanol In Gallons [Member] | Cash Flow Hedges [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | (235,620,000) | [1],[2] | ||||||||
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Futures [Member] | Exchange Traded Net Long & Short [Member] | Natural Gas In mmBTU [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 98,000 | [1] | ||||||||
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Options [Member] | Exchange Traded Net Long & Short [Member] | Ethanol In Gallons [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 6,659,000 | [1] | ||||||||
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Options [Member] | Exchange Traded Net Long & Short [Member] | Natural Gas In mmBTU [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | (42,000) | [1] | ||||||||
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Options [Member] | Exchange Traded Net Long & Short [Member] | Corn And Soybeans In Bushels [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 7,242,000 | [1] | ||||||||
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Forwards [Member] | Non-Exchange Traded Long [Member] | Ethanol In Gallons [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 5,386,000 | [4] | ||||||||
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Forwards [Member] | Non-Exchange Traded Long [Member] | Corn And Soybeans In Bushels [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 10,127,000 | [4] | ||||||||
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Forwards [Member] | Non-Exchange Traded Long [Member] | Distillers Grains In Tons [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 91,000 | [4] | ||||||||
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Forwards [Member] | Non-Exchange Traded Long [Member] | Corn Oil in Pounds [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | (37,491,000) | [4] | ||||||||
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Forwards [Member] | Non-Exchange Traded Short [Member] | Ethanol In Gallons [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | (129,584,000) | [4] | ||||||||
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Forwards [Member] | Non-Exchange Traded Short [Member] | Corn And Soybeans In Bushels [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | (4,709,000) | [4] | ||||||||
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Forwards [Member] | Non-Exchange Traded Short [Member] | Distillers Grains In Tons [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | (399,000) | [4] | ||||||||
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Forwards [Member] | Non-Exchange Traded Short [Member] | Corn Oil in Pounds [Member]
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| Derivative [Line Items] | ||||||||||
| Volumes of open commodity derivatives | 3,408,000 | [4] | ||||||||
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