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Partners' Capital and Distributions (Details 5) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Partners Capital and Distribution
Units Issued			23,563,707us-gaap_PartnersCapitalAccountUnitsSaleOfUnits
Net proceeds from sale	$ 866us-gaap_PartnersCapitalAccountSaleOfUnits	$ 477us-gaap_PartnersCapitalAccountSaleOfUnits	$ 979us-gaap_PartnersCapitalAccountSaleOfUnits
Contribution from general partner	18us-gaap_GeneralPartnersContributedCapital	9us-gaap_GeneralPartnersContributedCapital	20us-gaap_GeneralPartnersContributedCapital
Continuous Offering Program
Partners Capital and Distribution
Units Issued	15,375,810us-gaap_PartnersCapitalAccountUnitsSaleOfUnits / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember	8,644,807us-gaap_PartnersCapitalAccountUnitsSaleOfUnits / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember	12,063,707us-gaap_PartnersCapitalAccountUnitsSaleOfUnits / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember
Net proceeds from sale	866us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember	477us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember	524us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember
Commissions paid	9paa_CommissionPaidToSalesAgent / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember	5paa_CommissionPaidToSalesAgent / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember	6paa_CommissionPaidToSalesAgent / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember
Continuous Offering Program | Minimum
Partners Capital and Distribution
Aggregate offer price of common stock			300paa_AggregateCommonStockOfferPrice / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember
Continuous Offering Program | Maximum
Partners Capital and Distribution
Aggregate offer price of common stock	900paa_AggregateCommonStockOfferPrice / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsidiarySaleOfStockAxis = paa_ContinuousOfferingProgramMember
Marketed Offering
Partners Capital and Distribution
Units Issued			11,500,000us-gaap_PartnersCapitalAccountUnitsSaleOfUnits / us-gaap_SubsidiarySaleOfStockAxis = paa_MarketedOfferingsMember
Net proceeds from sale			$ 455us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_SubsidiarySaleOfStockAxis = paa_MarketedOfferingsMember

X

- Definition

Represents the aggregate offering price for which an entity may issue and sell common units through a specific equity distribution agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	paa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the costs incurred for commissions paid to the agent under the equity distribution agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	paa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:	paa_
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X

- Definition

The amount of capital contributed by the general partner.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Total change in each class of partners' capital accounts during the year due to the sale of units. All partners include general, limited and preferred partners.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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- Details

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- Details

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