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Income Taxes (Detail 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income before tax $ 1,557us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest $ 1,490us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest $ 1,181us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Partnership earnings not subject to current Canadian tax (976)paa_IncomeNotSubjectToForeignTax (1,187)paa_IncomeNotSubjectToForeignTax (1,046)paa_IncomeNotSubjectToForeignTax
Partnership earnings subject to current Canadian tax 581paa_IncomeSubjectToForeignTax 303paa_IncomeSubjectToForeignTax 135paa_IncomeSubjectToForeignTax
Canadian federal and provincial corporate tax rate (as a percent) 25.00%paa_ForeignTaxRate 25.00%paa_ForeignTaxRate 25.00%paa_ForeignTaxRate
Income tax at statutory rate 145paa_ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate 76paa_ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate 34paa_ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate
Canadian withholding tax 16paa_ExpenseForWithholdingTaxes 19paa_ExpenseForWithholdingTaxes 18paa_ExpenseForWithholdingTaxes
Canadian permanent differences and rate changes 9paa_ForeignPeriodTaxOnPermanentBookVersusTaxDifferencesAndRateChanges 3paa_ForeignPeriodTaxOnPermanentBookVersusTaxDifferencesAndRateChanges  
State income tax 1us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 2us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Total income tax expense 171us-gaap_IncomeTaxExpenseBenefit 99us-gaap_IncomeTaxExpenseBenefit 54us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets:      
Book accruals in excess of current tax deductions 29us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 41us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals  
Net operating losses 2us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Derivative instruments   15us-gaap_DeferredTaxAssetsDerivativeInstruments  
Total deferred tax assets 31us-gaap_DeferredTaxAssetsNet 56us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:      
Derivative instruments (71)us-gaap_DeferredTaxLiabilitiesDerivatives    
Property and equipment in excess of tax values (322)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (332)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Other (49)us-gaap_DeferredTaxLiabilitiesOther (66)us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities (442)us-gaap_DeferredIncomeTaxLiabilities (398)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets/(liabilities) (411)us-gaap_DeferredTaxLiabilities (342)us-gaap_DeferredTaxLiabilities  
Foreign      
Deferred tax liabilities:      
Operating loss carryforwards 8us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Other long-term assets      
Deferred tax assets:      
Net deferred tax assets/(liabilities) 2us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember		    
Other current liabilities      
Deferred tax liabilities:      
Net deferred tax assets/(liabilities) (64)us-gaap_DeferredTaxLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember		    
Other long-term liabilities      
Deferred tax liabilities:      
Net deferred tax assets/(liabilities) $ (349)us-gaap_DeferredTaxLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		 $ (342)us-gaap_DeferredTaxLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember