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Derivative Financial Instruments (Schedule Of NYMEX Contracts And Butane Price Swap Purchase Agreements) (Details)
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Mar. 31, 2014
bbl
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|---|---|
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Fair Value Hedging [Member]
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| Derivative [Line Items] | |
| Derivative, Nonmonetary Notional Amount | 700,000 |
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Economic Hedges [Member]
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| Derivative [Line Items] | |
| Derivative, Nonmonetary Notional Amount | 2,200,000 |
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Economic Hedges Futures [Member]
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| Derivative [Line Items] | |
| Derivative, Nonmonetary Notional Amount | 100,000 |