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Partners' Capital and Distributions - Income Allocation (Details) | Dec. 31, 2018
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Partners' Capital Notes [Abstract] |
Net income allocation | 100.00%

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- Definition Partnership Agreement, Net Income Allocation Percent + References No definition available. + Details
Name: | paa_PartnershipAgreementNetIncomeAllocationPercent
Namespace Prefix: | paa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_PartnersCapitalNotesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration