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Other Assets, Net (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Assets, Net
Intangible assets	$ 676us-gaap_FiniteLivedIntangibleAssetsGross	$ 674us-gaap_FiniteLivedIntangibleAssetsGross
Debt issue costs	92us-gaap_DeferredFinanceCostsNoncurrentGross	70us-gaap_DeferredFinanceCostsNoncurrentGross
Fair value of derivative instruments	27us-gaap_DerivativeInstrumentsAndHedgesNoncurrent	30us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
Other	19us-gaap_OtherAssetsMiscellaneousNoncurrent	37us-gaap_OtherAssetsMiscellaneousNoncurrent
Other assets, gross	814paa_OtherAssetsNoncurrentGross	811paa_OtherAssetsNoncurrentGross
Accumulated amortization	(325)paa_AccumulatedAmortizationOfOtherAssetsNoncurrent	(271)paa_AccumulatedAmortizationOfOtherAssetsNoncurrent
Other assets, net	489us-gaap_OtherAssetsNoncurrent	540us-gaap_OtherAssetsNoncurrent
Debt issue costs capitalized during the period	24us-gaap_DebtIssuanceCosts	9us-gaap_DebtIssuanceCosts
Gross debt issue costs removed from balance sheet	2us-gaap_WriteOffOfDeferredDebtIssuanceCost	8us-gaap_WriteOffOfDeferredDebtIssuanceCost
Amortization expense related to other assets (including finite-lived intangible assets)	64us-gaap_AmortizationOfDeferredCharges	96us-gaap_AmortizationOfDeferredCharges	99us-gaap_AmortizationOfDeferredCharges
Amortization expense for finite-lived intangible assets	$ 57us-gaap_AmortizationOfIntangibleAssets	$ 85us-gaap_AmortizationOfIntangibleAssets	$ 90us-gaap_AmortizationOfIntangibleAssets

X

- Definition

Carrying amount of accumulated amortization of noncurrent assets not separately disclosed in the balance sheet.

+ References

No definition available.

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- Definition

Gross amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

No definition available.

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- Definition

The amount of amortization of deferred charges applied against earnings during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

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- Definition

Gross amount, as of the balance sheet date, of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings in periods after one year or beyond the normal operating cycle, if longer, over the life of the long-term debt instruments to which such costs pertain.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399



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-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

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- Definition

Carrying amount as of the balance sheet date of the assets arising from derivative contracts and hedging activities, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

+ References

No definition available.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

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

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-Topic 210

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-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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