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Description Of Business And Significant Accounting Policies (Schedule Of Estimated Useful Lives Of Assets) (Details)
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12 Months Ended |
|---|---|
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Dec. 31, 2011
years
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Buildings And Improvements [Member]
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| Property, Plant and Equipment [Line Items] | |
| Property, plant and equipment, useful life, maximum (in years) | 25 |
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Plant And Equipment [Member]
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| Property, Plant and Equipment [Line Items] | |
| Property, plant and equipment, useful life, maximum (in years) | 25 |
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Ethylene Pipeline [Member]
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|
| Property, Plant and Equipment [Line Items] | |
| Property, plant and equipment, useful life, maximum (in years) | 35 |
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Other [Member]
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|
| Property, Plant and Equipment [Line Items] | |
| Property, plant and equipment, useful life, minimum (in years) | 3 |
| Property, plant and equipment, useful life, maximum (in years) | 10 |