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Net Income Per Limited Partner Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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 | $ 389 us-gaap_NetIncomeLoss | $ 323 us-gaap_NetIncomeLoss | $ 287 us-gaap_NetIncomeLoss | $ 384 us-gaap_NetIncomeLoss | $ 309 us-gaap_NetIncomeLoss | $ 231 us-gaap_NetIncomeLoss | $ 292 us-gaap_NetIncomeLoss | $ 528 us-gaap_NetIncomeLoss | $ 1,384 us-gaap_NetIncomeLoss | $ 1,361 us-gaap_NetIncomeLoss | $ 1,094 us-gaap_NetIncomeLoss
Less: General partner's incentive distribution |  |  |  |  |  |  |  |  | (482)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings | (375)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings | (289)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings
Less: General partner 2% ownership |  |  |  |  |  |  |  |  | (18)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution | (19)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution | (16)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution
Net income available to limited partners |  |  |  |  |  |  |  |  | 884 us-gaap_NetIncomeLossAllocatedToLimitedPartners | 967 us-gaap_NetIncomeLossAllocatedToLimitedPartners | 789 us-gaap_NetIncomeLossAllocatedToLimitedPartners
Less: Undistributed earnings allocated and distributions to participating securities |  |  |  |  |  |  |  |  | (6)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | (7)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | (5)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Net income available to limited partners in accordance with application of the two-class method for MLPs |  |  |  |  |  |  |  |  | 878 paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsBasic | 960 paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsBasic | 784 paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsBasic
Basic weighted average limited partner units outstanding (in units) |  |  |  |  |  |  |  |  | 367 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding | 341 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding | 325 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding
Basic net income per limited partner unit (in dollars per unit) | $ 0.67 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.52 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.45 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.74 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.59 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.38 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.58 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.28 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 2.39 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 2.82 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 2.41 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Diluted Net Income per Limited Partner Unit |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAA | 389 us-gaap_NetIncomeLoss | 323 us-gaap_NetIncomeLoss | 287 us-gaap_NetIncomeLoss | 384 us-gaap_NetIncomeLoss | 309 us-gaap_NetIncomeLoss | 231 us-gaap_NetIncomeLoss | 292 us-gaap_NetIncomeLoss | 528 us-gaap_NetIncomeLoss | 1,384 us-gaap_NetIncomeLoss | 1,361 us-gaap_NetIncomeLoss | 1,094 us-gaap_NetIncomeLoss
Less: General partner's incentive distribution |  |  |  |  |  |  |  |  | (482)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings | (375)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings | (289)paa_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings
Less: General partner 2% ownership |  |  |  |  |  |  |  |  | (18)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution | (19)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution | (16)paa_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution
Net income available to limited partners |  |  |  |  |  |  |  |  | 884 paa_NetIncomeLossAllocatedToLimitedPartnersDiluted | 967 paa_NetIncomeLossAllocatedToLimitedPartnersDiluted | 789 paa_NetIncomeLossAllocatedToLimitedPartnersDiluted
Less: Undistributed earnings allocated and distributions to participating securities |  |  |  |  |  |  |  |  | (6)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted | (6)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted | (4)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted
Net income available to limited partners in accordance with application of the two-class method for MLPs |  |  |  |  |  |  |  |  | $ 878 paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsDiluted | $ 961 paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsDiluted | $ 785 paa_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLPsDiluted
Basic weighted average limited partner units outstanding (in units) |  |  |  |  |  |  |  |  | 367 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding | 341 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding | 325 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Weighted average LTIP units (in units) |  |  |  |  |  |  |  |  | 2 us-gaap_WeightedAverageNumerDilutedLimitedPartnershipUnitsOutstandingAdjustment | 2 us-gaap_WeightedAverageNumerDilutedLimitedPartnershipUnitsOutstandingAdjustment | 3 us-gaap_WeightedAverageNumerDilutedLimitedPartnershipUnitsOutstandingAdjustment
Diluted weighted average limited partner units outstanding (in units) |  |  |  |  |  |  |  |  | 369 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted | 343 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted | 328 us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted
Diluted net income per limited partner unit (in dollars per unit) | $ 0.67 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.52 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.45 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.73 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.58 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.38 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.57 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 1.27 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 2.38 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 2.80 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 2.40 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted

X
- Definition Amount of incentive distribution paid or to be paid to the general partner based on current period earnings. + References No definition available. + Details
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- Definition The general partner's ownership allocation of net income attributable to the parent after the incentive distribution is paid. + References No definition available. + Details
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- Definition Aggregate amount of net income allocated to limited partners in the calculated of diluted net income per limited partner unit. + References No definition available. + Details
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- Definition This element represents the net income (loss) available to limited partners in the calculation of basic net income per limited partner unit after making an adjustment in accordance with the application of the two-class method for Master Limited Partnerships (MLPs). + References No definition available. + Details
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- Definition This element represents the net income (loss) available to limited partners in the calculation of diluted net income per limited partner unit after making an adjustment in accordance with the application of the two-class method for Master Limited Partnerships (MLPs). + References No definition available. + Details
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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: 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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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition Aggregate amount of net income allocated to limited partners. + References Reference 1: 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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- Definition 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. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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- Definition Per unit of ownership amount after tax of income (loss) available to outstanding limited partnership (LP) unit-holder. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 + Details
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- Definition Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 + Details
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- Definition 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. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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- Definition 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. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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- Definition The sum of dilutive potential limited partnership units used in the calculation of the diluted per-unit computation. + References No definition available. + Details
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