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Commitments and Contingencies (Details 3) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Rangeland Pipeline Release	Jun. 30, 2012 Rangeland Pipeline Release Less than barrel
Loss Contingencies
Estimated size of release (in barrels)				1,000
Total estimated cost to clean up and remediate the site, before insurance recoveries			$ 53
Recognized remaining undiscounted gross environmental remediation liability			48
Probable recoveries from insurers, net of deductibles	$ 57	$ 47	$ 42

Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements.

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