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Partners' Capital and Distributions (Details 7) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2009	Dec. 31, 2008 mi	Dec. 31, 2009	Dec. 31, 2011
Partners Capital and Distribution
Noncontrolling Interest, Ownership interest of reporting entity (as a percent)				100.00%
SLC Pipeline
Partners Capital and Distribution
Construction of pipeline completed in Salt Lake City Area system (in miles)		94
Book value of pipeline contributed	$ 254
Cash contribution made by Holly Energy Partners LP	26
Ownership percentage acquired by Holly Energy Partners LP (as a percent)	25.00%
Noncontrolling Interest, Ownership interest of reporting entity (as a percent)				75.00%
Noncontrolling interests, ownership percentage of noncontrolling owners (as a percent)	25.00%			25.00%
Loss recognized in partners' capital relating to formation of joint venture			$ 38

X

- Definition

This element represents the length of construction of pipeline completed during the period.

+ References

No definition available.

+ Details

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X

- Definition

The equity interest acquired during the period by noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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X

- Definition

The loss recognized in partners' capital relating to the formation of a joint venture, which represents the difference between the cash contribution received from the co-venturer and the book value of the co-venturers' interest in the net assets of the joint venture.

+ References

No definition available.

+ Details

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X

- Definition

The cash contribution made by a co-venture to the joint venture, as recorded in partners' capital.

+ References

No definition available.

+ Details

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Namespace Prefix:	paa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Value of property contributed in noncash investing and financing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-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.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

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