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Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Mar. 31, 2015
Short-term debt:
Other short-term debt	$ 3us-gaap_OtherLongTermDebtCurrent	$ 3us-gaap_OtherLongTermDebtCurrent
Total short-term debt	1,287us-gaap_DebtCurrent	553us-gaap_DebtCurrent
Long-term debt:
Senior notes, net of unamortized discount of $17 and $18, respectively	8,757us-gaap_SeniorLongTermNotes	8,758us-gaap_SeniorLongTermNotes
Unamortized discount	18us-gaap_DebtInstrumentUnamortizedDiscount	17us-gaap_DebtInstrumentUnamortizedDiscount
Long-term debt, other	5us-gaap_OtherLongTermDebtNoncurrent	5us-gaap_OtherLongTermDebtNoncurrent
Total long-term debt	8,762us-gaap_LongTermDebtAndCapitalLeaseObligations	8,763us-gaap_LongTermDebtAndCapitalLeaseObligations
Total debt	10,049us-gaap_DebtAndCapitalLeaseObligations	9,316us-gaap_DebtAndCapitalLeaseObligations
Commercial paper program
Short-term debt:
Commercial paper notes, bearing a weighted-average interest rate of 0.46% at December 31, 2014	734us-gaap_CommercialPaper / us-gaap_CreditFacilityAxis = us-gaap_CommercialPaperMember
Repayment period	1 year
Weighted average interest rate, short-term (as a percent)	0.46%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = us-gaap_CommercialPaperMember
5.25% senior notes due June 2015
Short-term debt:
Senior Notes, Current	150us-gaap_SeniorNotesCurrent / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2015At5.25PercentMember	150us-gaap_SeniorNotesCurrent / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2015At5.25PercentMember
Long-term debt:
Debt instrument, interest rate (as a percent)	5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2015At5.25PercentMember	5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2015At5.25PercentMember
3.95% senior notes due September 2015
Short-term debt:
Senior Notes, Current	$ 400us-gaap_SeniorNotesCurrent / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInSeptember2015At3.95PercentMember	$ 400us-gaap_SeniorNotesCurrent / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInSeptember2015At3.95PercentMember
Long-term debt:
Debt instrument, interest rate (as a percent)	3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInSeptember2015At3.95PercentMember	3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInSeptember2015At3.95PercentMember

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The period, in years, within which the short-term borrowings must be repaid.

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Contractual interest rate for funds borrowed, under the debt agreement.

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