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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net lease right-of-use assets recognized upon adoption of Topic 842 | $ 574 |
Lease liabilities recognized upon adoption of Topic 842 | $ 548 |
ASU 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net lease right-of-use assets recognized upon adoption of Topic 842 |  | $ 560
Lease liabilities recognized upon adoption of Topic 842 |  | $ 570

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- Definition Leases, Liability + References No definition available. + Details
Name: | paa_LeasesLiability
Namespace Prefix: | paa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Leases, Right-Of-Use Asset + References No definition available. + Details
Name: | paa_LeasesRightOfUseAsset
Namespace Prefix: | paa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |