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Equity-Indexed Compensation Plans (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Consolidated Equity-Indexed Compensation Plan Information    
Equity-indexed compensation expense $ 19us-gaap_AllocatedShareBasedCompensationExpense $ 34us-gaap_AllocatedShareBasedCompensationExpense
LTIP unit-settled vestings   5paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue
LTIP cash-settled vestings   1paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled
DER cash payments 2paa_DistributionEquivalentRightsCashPayments 2paa_DistributionEquivalentRightsCashPayments
Maximum    
Other Consolidated Equity-Indexed Compensation Plan Information    
LTIP cash-settled vestings $ 1paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled
/ us-gaap_RangeAxis
= us-gaap_MaximumMember