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Partners' Capital and Distributions (Detail 8) (USD $) In Millions, 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 attributable to PAA |  |  |  |  |  |  |  |  |  |  |
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
Transfers to/from noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |
Increase in capital from sale of PNG common units |  |  |  |  |  |  |  |  |  | 40 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests |
Net transfers to/from noncontrolling interests |  |  |  |  |  |  |  |  |  | 12 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet |
Partners' Capital Excluding Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Transfers to/from noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |
Increase in capital from sale of PNG common units |  |  |  |  |  |  |  |  |  | 8 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests / us-gaap_PartnerCapitalComponentsAxis = us-gaap_ParentMember |
Net transfers to/from noncontrolling interests |  |  |  |  |  |  |  |  |  | 475 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / us-gaap_PartnerCapitalComponentsAxis = us-gaap_ParentMember |
Partners' Capital Excluding Noncontrolling Interests | PNG |  |  |  |  |  |  |  |  |  |  |
Net Income attributable to PAA |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PAA |  |  |  |  |  |  |  |  |  | 1,361 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = paa_PNGMember / us-gaap_PartnerCapitalComponentsAxis = us-gaap_ParentMember |
Transfers to/from noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |
Increase in capital from sale of PNG common units |  |  |  |  |  |  |  |  |  | 8 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests / dei_LegalEntityAxis = paa_PNGMember / us-gaap_PartnerCapitalComponentsAxis = us-gaap_ParentMember |
Decrease in capital from purchase of PNG common units in conjunction with the PNG Merger |  |  |  |  |  |  |  |  |  | (290)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / dei_LegalEntityAxis = paa_PNGMember / us-gaap_PartnerCapitalComponentsAxis = us-gaap_ParentMember |
Net transfers to/from noncontrolling interests |  |  |  |  |  |  |  |  |  | (282)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = paa_PNGMember / us-gaap_PartnerCapitalComponentsAxis = us-gaap_ParentMember |
Change from net income attributable to PAA and net transfers to/from noncontrolling interests |  |  |  |  |  |  |  |  |  | $ 1,079 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet / dei_LegalEntityAxis = paa_PNGMember / us-gaap_PartnerCapitalComponentsAxis = us-gaap_ParentMember |

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- Definition This element represents the total net income attributable to the parent for the period and the effect of net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not result in a deconsolidation of the subsidiary from the consolidated financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -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 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686 + Details
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- Definition Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -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 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686 + Details
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- Definition The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -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 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686 + Details
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- Definition Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -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 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686 + Details
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