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Debt (Details 2) (USD $)	12 Months Ended			1 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2014	Jan. 31, 2015	Dec. 13, 2013	Sep. 04, 2012	Oct. 31, 2014	Sep. 30, 2014
Debt
Consolidated subsidiary, ownership interest held by the parent (as a percent)	100.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Repayments of senior notes		$ 250,000,000us-gaap_RepaymentsOfSeniorDebt	$ 500,000,000us-gaap_RepaymentsOfSeniorDebt
Commercial paper program
Debt
Maximum aggregate borrowing capacity	3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember							3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember	1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember
Letters of credit
Debt
Outstanding letters of credit	87,000,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_StandbyLettersOfCreditMember	41,000,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_StandbyLettersOfCreditMember
Letters of credit | Maximum
Debt
Periods for which letters of credit are issued	70 days
PAA senior secured hedged inventory facility
Debt
Borrowing capacity	1,400,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = paa_SeniorSecuredHedgedInventoryDebtFacilityMember
Maximum aggregate borrowing capacity	1,900,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = paa_SeniorSecuredHedgedInventoryDebtFacilityMember
Basis Variable interest rate used	Eurocurrency Rate or the Base Rate
Number of years by which maturity date of credit facility may be extended	1 year
Number of years by which maturity date of credit facility was extended during the period.				1 year
PAA senior secured hedged inventory facility | Minimum
Debt
Credit facility extensions available	1paa_NumberOfOneYearExtensionsOfRevolvingCreditFacility / us-gaap_DebtInstrumentAxis = paa_SeniorSecuredHedgedInventoryDebtFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
PAA senior secured hedged inventory facility | Letters of credit
Debt
Borrowing capacity	400,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = paa_SeniorSecuredHedgedInventoryDebtFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_StandbyLettersOfCreditMember
PAA senior unsecured revolving credit facility
Debt
Borrowing capacity	1,600,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = paa_SeniorUnsecuredRevolvingCreditFacilityMember
Maximum aggregate borrowing capacity	2,100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = paa_SeniorUnsecuredRevolvingCreditFacilityMember
Basis Variable interest rate used	Eurocurrency Rate, the Base Rate or the Canadian Prime Rate
Number of years by which maturity date of credit facility may be extended	1 year
Number of years by which maturity date of credit facility was extended during the period.				1 year
PAA senior unsecured revolving credit facility | Minimum
Debt
Credit facility extensions available	1paa_NumberOfOneYearExtensionsOfRevolvingCreditFacility / us-gaap_DebtInstrumentAxis = paa_SeniorUnsecuredRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
PAA senior unsecured 364-day revolving credit facility | Subsequent Event
Debt
Expiration period for credit facility					364 days
Borrowing capacity					1,000,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = paa_SeniorUnsecured364DayRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Basis Variable interest rate used	Eurocurrency Rate or the Base Rate
Credit agreements and commercial paper program
Debt
Total borrowings	70,900,000,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = paa_LineOfCreditAndCommercialPaperMember	31,000,000,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = paa_LineOfCreditAndCommercialPaperMember	12,900,000,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = paa_LineOfCreditAndCommercialPaperMember
Total repayments	71,300,000,000us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = paa_LineOfCreditAndCommercialPaperMember	31,000,000,000us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = paa_LineOfCreditAndCommercialPaperMember	12,200,000,000us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = paa_LineOfCreditAndCommercialPaperMember
PAA senior notes
Debt
Debt instrument face value	9,300,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = us-gaap_SeniorNotesMember	6,700,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = us-gaap_SeniorNotesMember
PAA senior notes | Level 2
Debt
Debt instrument fair value	9,900,000,000us-gaap_DebtInstrumentFairValue / us-gaap_CreditFacilityAxis = us-gaap_SeniorNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	7,200,000,000us-gaap_DebtInstrumentFairValue / us-gaap_CreditFacilityAxis = us-gaap_SeniorNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
2.60% senior notes due December 2019
Debt
Debt instrument, interest rate (as a percent)	2.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInDecember2019At2.60PercentMember
Percentage of face value at which senior notes are sold	99.813%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInDecember2019At2.60PercentMember
Debt instrument face value	500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInDecember2019At2.60PercentMember
4.90% senior notes due February 2045
Debt
Debt instrument, interest rate (as a percent)	4.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInFebruary2045At4.90PercentMember
Percentage of face value at which senior notes are sold	99.876%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInFebruary2045At4.90PercentMember
Debt instrument face value	650,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInFebruary2045At4.90PercentMember
3.60% senior notes due November 2024
Debt
Debt instrument, interest rate (as a percent)	3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInNovember2024At3.60PercentMember
Percentage of face value at which senior notes are sold	99.842%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInNovember2024At3.60PercentMember
Debt instrument face value	750,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInNovember2024At3.60PercentMember
4.70% senior notes due June 2044
Debt
Debt instrument, interest rate (as a percent)	4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2044At4.70PercentMember
Percentage of face value at which senior notes are sold	99.734%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2044At4.70PercentMember
Debt instrument face value	700,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2044At4.70PercentMember
3.85% senior notes due October 2023
Debt
Debt instrument, interest rate (as a percent)	3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDue2023At3.85PercentMember	3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDue2023At3.85PercentMember
Percentage of face value at which senior notes are sold		99.792%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDue2023At3.85PercentMember
Debt instrument face value		700,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDue2023At3.85PercentMember
2.85% senior notes due January 2023
Debt
Debt instrument, interest rate (as a percent)	2.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2023At2.85PercentMember	2.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2023At2.85PercentMember	2.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2023At2.85PercentMember
Percentage of face value at which senior notes are sold			99.752%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2023At2.85PercentMember
Debt instrument face value			400,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2023At2.85PercentMember
4.30% senior notes due January 2043
Debt
Debt instrument, interest rate (as a percent)	4.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2043At4.30PercentMember	4.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2043At4.30PercentMember	4.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2043At4.30PercentMember
Percentage of face value at which senior notes are sold			99.925%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2043At4.30PercentMember
Debt instrument face value			350,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJanuary2043At4.30PercentMember
3.65% senior notes due June 2022
Debt
Debt instrument, interest rate (as a percent)	3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2022At3.65PercentMember	3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2022At3.65PercentMember	3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2022At3.65PercentMember
Percentage of face value at which senior notes are sold			99.823%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2022At3.65PercentMember
Debt instrument face value			750,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2022At3.65PercentMember
5.15% senior notes due June 2042
Debt
Debt instrument, interest rate (as a percent)	5.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2042At5.15PercentMember	5.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2042At5.15PercentMember	5.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2042At5.15PercentMember
Percentage of face value at which senior notes are sold			99.755%paa_PercentageOfFaceValueAtWhichSeniorNotesAreSold / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2042At5.15PercentMember
Debt instrument face value			500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = paa_SeniorNotesDueInJune2042At5.15PercentMember
5.63% senior notes
Debt
Debt instrument, interest rate (as a percent)						5.63%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesAt5.63PercentMember
Repayments of senior notes						250,000,000us-gaap_RepaymentsOfSeniorDebt / us-gaap_CreditFacilityAxis = paa_SeniorNotesAt5.63PercentMember
4.25% senior notes
Debt
Debt instrument, interest rate (as a percent)							4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = paa_SeniorNotesAt4.25PercentMember
Repayments of senior notes							$ 500,000,000us-gaap_RepaymentsOfSeniorDebt / us-gaap_CreditFacilityAxis = paa_SeniorNotesAt4.25PercentMember

X

- Definition

Represents the number of years by which the maturity date of debt instrument was extended.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period for which the credit facility may be extended by the entity, pursuant to the terms of the credit agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	paa_
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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of one-year extensions provided for under the credit facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

This element represents the percentage of face value of senior notes, at which they are sold.

+ References

No definition available.

+ Details

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Namespace Prefix:	paa_
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X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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-SubTopic 30

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Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

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-SubTopic 10

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-Paragraph 12

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Balance Type:	credit
Period Type:	instant

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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- Details

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X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
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X

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Number 210

-Section 02

-Paragraph 19, 22

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Balance Type:	credit
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X

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

No definition available.

+ Details

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