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Related Party Transactions (Details) (Oxy, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Oxy
     
Related party transaction      
Related party ownership of general partner interest (as a percent) 13.00%paa_RelatedPartyOwnershipInterestInGeneralPartnerPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember
   
Revenues $ 176us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember
$ 92us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember
 
Purchases and related costs 104us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember
259us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember
 
Trade accounts receivable and other receivables, gross 465us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember
  489us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember
Accounts payable, gross $ 410us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember
  $ 441us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_OxyMember