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Derivatives and Risk Management Activities (Details 3) In Millions, unless otherwise specified	Dec. 31, 2014 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.16 maturing in 2015 USD ($)	Dec. 31, 2014 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.16 maturing in 2015 CAD	Dec. 31, 2014 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.12 maturing in 2015 USD ($)	Dec. 31, 2014 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.12 maturing in 2015 CAD
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 460invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2015Member	535invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2015Member	$ 345invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2015Member	387invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2015Member
Average exchange rate		1.16us-gaap_DerivativeAverageForwardExchangeRate1 / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2015Member		1.12us-gaap_DerivativeAverageForwardExchangeRate1 / us-gaap_DerivativeInstrumentRiskAxis = paa_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2015Member

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

Name:	us-gaap_DerivativeAverageForwardExchangeRate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration