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Partners' Capital and Distributions (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Partners Capital and Distribution
Units Issued	5,750,000
Gross Unit Price (in dollars per unit)	$ 80.03
Proceeds from Sale	$ 460
General Partner Contribution	9
Costs	(14)
Net Proceeds	$ 455

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- Definition

This element represents the gross unit price per capital unit.

+ References

No definition available.

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- Definition

The amount of capital contributed by the general partner.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

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- Definition

The amount of capital contributed by the limited partners.

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- Definition

Costs incurred in connection with the offering and selling of additional partner interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section D



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- Definition

Total change in each class of partners' capital accounts during the year due to the sale of units. All partners include general, limited and preferred partners.

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-Name Emerging Issues Task Force (EITF)

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- Definition

Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher AICPA

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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