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Derivatives and Risk Management Activities (Details 3) In Millions, unless otherwise specified	Mar. 31, 2015 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.27 maturing in 2015 USD ($)	Mar. 31, 2015 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.27 maturing in 2015 CAD	Mar. 31, 2015 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.27 maturing in 2016 USD ($)	Mar. 31, 2015 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.27 maturing in 2016 CAD	Mar. 31, 2015 Forward exchange contracts that exchange CAD for USD USD ($)	Mar. 31, 2015 Forward exchange contracts that exchange CAD for USD CAD	Mar. 31, 2015 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.24 maturing in 2015 USD ($)	Mar. 31, 2015 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.24 maturing in 2015 CAD	Mar. 31, 2015 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.27 maturing in 2016 USD ($)	Mar. 31, 2015 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.27 maturing in 2016 CAD	Mar. 31, 2015 Forward exchange contracts that exchange USD for CAD USD ($)	Mar. 31, 2015 Forward exchange contracts that exchange USD for CAD CAD
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 147invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2015Member	187invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2015Member	$ 5invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2016Member	7invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2016Member	$ 152invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsMember	194invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsMember	$ 181invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2015Member	225invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2015Member	$ 5invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2016Member	7invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2016Member	$ 186invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsMember	232invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsMember
Average exchange rate		1.27us-gaap_DerivativeAverageForwardExchangeRate1 / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2015Member		1.27us-gaap_DerivativeAverageForwardExchangeRate1 / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2016Member				1.24us-gaap_DerivativeAverageForwardExchangeRate1 / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2015Member		1.27us-gaap_DerivativeAverageForwardExchangeRate1 / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2016Member

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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X

- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Period Type:	instant

X

- Details

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Data Type:	xbrli:stringItemType
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