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Commitments and Contingencies (Details 4) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Rainbow pipeline mi acres bbl
Loss Contingencies
Length of Pipeline Isolated and Depressurized (in miles)			45
Estimated volume of crude oil released (in barrels)			28,000
Area of land affected due to crude oil release (in acres)			40
Recognized remaining undiscounted gross environmental remediation liability			$ 58
Total estimated cost to clean-up and remediate the site, before insurance recoveries			72
Probable recoveries from insurers and third parties recorded as a receivable	$ 64	$ 5	$ 59

X

- Definition

Represents the area of land affected due to release of crude oil.

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- Definition

Represents the current estimated volume of crude oil released.

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- Definition

Represents the Length of pipeline isolated and depressurized to conduct clean-up operations.

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- Definition

Represents the estimated total cost to clean-up and remediate the site, before insurance recoveries.

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- Definition

The estimated aggregate undiscounted amount of the accrual for environmental loss contingencies as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 96-1
-Paragraph 161
-Subparagraph a

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section Y
-Paragraph Question 1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 96-1
-Paragraph 161

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