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Fair Value Measurements (Narrative) (Details) (Swap [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Fixed price swap contract (in gallons)	7,700,000
Average contract price (in dollars per gallon)	3.94
Average forward price (in dollars per gallon)	3.64
Accrued Expenses And Other Liabilities [Member]
Derivative [Line Items]
Derivative liability	$ 2	$ 1

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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