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Derivative Financial Instruments (Schedule Of NYMEX Contracts And Butane Price Swap Purchase Agreements) (Details)
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Sep. 30, 2014
bbl
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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 | 4,000,000 | [1] | ||
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Economic Hedges Futures [Member]
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| Derivative [Line Items] | ||||
| Derivative, Nonmonetary Notional Amount | 900,000 | |||
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Basis Swap [Member]
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| Derivative [Line Items] | ||||
| Derivative, Nonmonetary Notional Amount | 800,000 | |||
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