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Net Income Per Limited Partner Unit (Details 2) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Diluted Net Income per Limited Partner Unit (prior period adjusted for stock split) |  |  |
Basic net income per limited partner unit impact (in dollars per unit) | $ (0.12) | $ (0.04) | $ (0.14)
Diluted net income per limited partner unit impact (in dollars per unit) | $ (0.12) | $ (0.04) | $ (0.14)

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- Definition The per unit impact on basic net income per limited partner unit in the event of allocation of undistributed earnings to incentive distribution rights holders. + References No definition available. + Details
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Namespace Prefix: | paa_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The per unit impact on diluted net income per limited partner unit in the event of allocation of undistributed earnings to incentive distribution rights holders. + References No definition available. + Details
Name: | paa_PerUnitImpactToNetIncomeLossPerOutstandingLimitedPartnershipUnitDiluted
Namespace Prefix: | paa_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration