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Derivatives and Risk Management Activities - Broker Receivable/Payable (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Assets, Liabilities [Line Items] |  |
Initial margin | $ 96 | $ 95
Variation margin returned | (131) | (91)
Letters of credit | (149) | (184)
Net broker payable | (110) | (80)
Exchange traded |  |
Offsetting Assets, Liabilities [Line Items] |  |
Letters of credit | $ (75) | $ (84)

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- Definition The amount of cash or securities required by a broker or counterparty as security for a trading or derivatives securities position. + References No definition available. + Details
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Namespace Prefix: | paa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Cash posted by (returned to) the reporting entity to (from) a broker or counterparty to comply with initial margin requirements. + References No definition available. + Details
Name: | paa_VariationMarginPostedReturned
Namespace Prefix: | paa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |