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Partners' Capital and Distributions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Partners' Capital and Distributions    
Common unitholders, units outstanding (in units) 375,107,793us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 359,133,200us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Ownership interest (as a percent) 98.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest  
General partner ownership interest (as a percent) 2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest  
Percentage of available cash distributed (as a percent) 100.00%paa_PercentageDistributionOfAvailableCash  
Number of days after end of quarter within which distributions must be paid to unitholders 45 days  
Partners Capital and Distribution    
Percent of distribution amount to the general partner before incentive distributions 2.00%paa_GeneralPartnerDistributionPercentage  
General Partner Distribution - Level One    
Partners Capital and Distribution    
Percent of distribution amount to the general partner before incentive distributions 2.00%paa_GeneralPartnerDistributionPercentage
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= paa_GeneralPartnerDistributionLevelOneMember
 
General Partner Distribution - Level Two    
Partners Capital and Distribution    
Percent of distribution amount to the general partner above threshold 15.00%paa_GeneralPartnerDistributionIncludingIncentiveDistributionPercentage
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= paa_GeneralPartnerDistributionLevelTwoMember
 
Quarterly incentive distribution threshold amount (in dollars per unit) 0.2250paa_GeneralPartnerIncentiveDistributionThreshold
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= paa_GeneralPartnerDistributionLevelTwoMember
 
General Partner Distribution - Level Three    
Partners Capital and Distribution    
Percent of distribution amount to the general partner above threshold 25.00%paa_GeneralPartnerDistributionIncludingIncentiveDistributionPercentage
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= paa_GeneralPartnerDistributionLevelThreeMember
 
Quarterly incentive distribution threshold amount (in dollars per unit) 0.2475paa_GeneralPartnerIncentiveDistributionThreshold
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= paa_GeneralPartnerDistributionLevelThreeMember
 
General Partner Distribution - Level Four    
Partners Capital and Distribution    
Percent of distribution amount to the general partner above threshold 50.00%paa_GeneralPartnerDistributionIncludingIncentiveDistributionPercentage
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= paa_GeneralPartnerDistributionLevelFourMember
 
Quarterly incentive distribution threshold amount (in dollars per unit) 0.3375paa_GeneralPartnerIncentiveDistributionThreshold
/ us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerAxis
= paa_GeneralPartnerDistributionLevelFourMember