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Net Income Per Limited Partner Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Income Per Limited Partner Unit
General partner ownership interest (as a percent)	2.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Basic Net Income per Limited Partner Unit
Net income attributable to PAA	$ 283us-gaap_NetIncomeLoss	$ 384us-gaap_NetIncomeLoss
Less: General partner's incentive distribution	(142)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings	(110)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings
Less: General partner 2% ownership	(3)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution	(6)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution
Net income available to limited partners	138us-gaap_NetIncomeLossAllocatedToLimitedPartners	268us-gaap_NetIncomeLossAllocatedToLimitedPartners
Less: Undistributed earnings allocated and distributions to participating securities	(2)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	(2)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Net income available to limited partners in accordance with application of the two-class method for MLPs	136paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsBasic	266paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsBasic
Basic weighted average limited partner units outstanding	383us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding	360us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding
Basic net income per limited partner unit	$ 0.36us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 0.74us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Diluted Net Income per Limited Partner Unit
Net income attributable to PAA	283us-gaap_NetIncomeLoss	384us-gaap_NetIncomeLoss
Less: General partner's incentive distribution	(142)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings	(110)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings
Less: General partner 2% ownership	(3)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution	(6)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution
Net income available to limited partners	138paa_NetIncomeLossAllocatedToLimitedPartnersDiluted	268paa_NetIncomeLossAllocatedToLimitedPartnersDiluted
Less: Undistributed earnings allocated and distributions to participating securities	(2)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	(2)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted
Net income available to limited partners in accordance with application of the two-class method for MLPs	$ 136paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsDiluted	$ 266paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsDiluted
Basic weighted average limited partner units outstanding	383us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding	360us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding
Effect of dilutive securities:
Weighted average LTIP units	2us-gaap_WeightedAverageNumerDilutedLimitedPartnershipUnitsOutstandingAdjustment	3us-gaap_WeightedAverageNumerDilutedLimitedPartnershipUnitsOutstandingAdjustment
Diluted weighted average limited partner units outstanding	385us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	363us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted
Diluted net income per limited partner unit	$ 0.35us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	$ 0.73us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted

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Amount of incentive distribution paid or to be paid to the general partner based on current period earnings.

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The general partner's ownership allocation of net income attributable to the parent after the incentive distribution is paid.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Aggregate amount of net income allocated to limited partners.

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Per unit of ownership amount after tax of income (loss) available to limited partnership (LP) unit-holder and units that would have been outstanding assuming the issuance of limited partner units for dilutive potential units outstanding.

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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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Weighted average number of limited partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership units have been outstanding to the total time in that period.

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Weighted average number of limited partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership units have been outstanding to the total time in that period. Used in the calculation of diluted net income or loss per limited partnership unit.

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The sum of dilutive potential limited partnership units used in the calculation of the diluted per-unit computation.

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