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Derivatives and Risk Management Activities (Details 3) In Millions, unless otherwise specified | Sep. 30, 2012 USD ($) | Sep. 30, 2012 Foreign exchange contracts USD ($) | Sep. 30, 2012 Foreign exchange contracts CAD | Sep. 30, 2012 Foreign exchange forward contract that exchange CAD for USD at the rate USD 1.02 to CAD 1.00 maturing in 2012 USD ($) | Sep. 30, 2012 Foreign exchange forward contract that exchange CAD for USD at the rate USD 1.02 to CAD 1.00 maturing in 2012 CAD | Sep. 30, 2012 Foreign exchange forward contract that exchange CAD for USD at the rate USD 1.00 to CAD 1.00 maturing in 2013 USD ($) | Sep. 30, 2012 Foreign exchange forward contract that exchange CAD for USD at the rate USD 1.00 to CAD 1.00 maturing in 2013 CAD | Sep. 30, 2012 Foreign exchange forward contract that exchange CAD for USD at the rate USD 1.01 to CAD 1.00 USD ($) | Sep. 30, 2012 Foreign exchange forward contract that exchange CAD for USD at the rate USD 1.01 to CAD 1.00 CAD | Sep. 30, 2012 Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00 maturing in 2012 USD ($) | Sep. 30, 2012 Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00 maturing in 2012 CAD | Sep. 30, 2012 Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00 maturing in 2013 USD ($) | Sep. 30, 2012 Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00 maturing in 2013 CAD | Sep. 30, 2012 Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00 USD ($) | Sep. 30, 2012 Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00 CAD | Sep. 30, 2012 Foreign exchange forward contract maturing in 2012 USD ($) | Sep. 30, 2012 Foreign exchange forward contract maturing in 2012 CAD | Sep. 30, 2012 Foreign exchange forward contract maturing in 2013 USD ($) | Sep. 30, 2012 Foreign exchange forward contract maturing in 2013 CAD
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Currency Exchange Rate Risk Hedging: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net deferred gains from currency risk rate hedging included in AOCI | $ 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of outstanding foreign currency forward exchange contracts |  | $ 169 | 173 | $ 94 | 92 | $ 9 | 9 | $ 103 | 101 | $ 123 | 124 | $ 149 | 150 | $ 272 | 274 | $ 29 | 32 | $ 140 | 141
Average exchange rate for outstanding foreign currency forward exchange contracts |  |  |  | 1.02 | 1.02 | 1.00 | 1.00 | 1.01 | 1.01 | 0.99 | 0.99 | 0.99 | 0.99 | 0.99 | 0.99 |  |  |  |

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- Definition This element represents the pre-tax gain or loss on open and settled foreign currency cash flow hedges, which are included in AOCI. + References No definition available. + Details
Name: | paa_GainLossOnForeignCurrencyCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncome
Namespace Prefix: | paa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- Details
Name: | us-gaap_ForeignCurrencyDerivativesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
Name: | us-gaap_NotionalAmountOfForeignCurrencyDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant