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Equity-Indexed Compensation Plans (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Consolidated Equity-Indexed Compensation Plan Information      
Equity-indexed compensation expense $ 98us-gaap_AllocatedShareBasedCompensationExpense $ 116us-gaap_AllocatedShareBasedCompensationExpense $ 101us-gaap_AllocatedShareBasedCompensationExpense
LTIP unit-settled vestings 53paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue 48paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue 62paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue
LTIP cash-settled vestings 53paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled 61paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled 66paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled
DER cash payments 8paa_DistributionEquivalentRightsCashPayments 8paa_DistributionEquivalentRightsCashPayments 7paa_DistributionEquivalentRightsCashPayments
Equity-Indexed Compensation Plan Fair Value Amortization      
2015 70paa_EquityBasedCompensationFairValueFutureAmortizationExpenseYearOne    
2016 46paa_EquityBasedCompensationFairValueFutureAmortizationExpenseYearTwo    
2017 21paa_EquityBasedCompensationFairValueFutureAmortizationExpenseYearThree    
2018 6paa_EquityBasedCompensationFairValueFutureAmortizationExpenseYearFour    
2019 1paa_EquityBasedCompensationFairValueFutureAmortizationExpenseYearFive    
Total 144us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
PNG      
Other Consolidated Equity-Indexed Compensation Plan Information      
LTIP unit-settled vestings     1paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_PNGMember
PNG | Maximum      
Other Consolidated Equity-Indexed Compensation Plan Information      
LTIP unit-settled vestings   $ 1paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= paa_PNGMember