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Partners' Capital and Distributions - Noncontrolling Interests in Subsidiaries (Details) - SLC Pipeline LLC | 3 Months Ended
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Dec. 31, 2018
Partners Capital and Distribution [Line Items] |
Ownership percentage sold | 75.00%
Noncontrolling interests in subsidiaries derecognized upon sale | 25.00%

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- Definition Consolidated Subsidiary, Ownership Percentage Sold + References No definition available. + Details
Name: | paa_ConsolidatedSubsidiaryOwnershipPercentageSold
Namespace Prefix: | paa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Noncontrolling Interest in Consolidated Subsidiary, Percentage Derecognized Upon Sale + References No definition available. + Details
Name: | paa_NoncontrollingInterestinConsolidatedSubsidiaryPercentageDerecognizedUponSale
Namespace Prefix: | paa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=paa_SLCPipelineLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |