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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
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

X

- 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

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

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

X

- 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