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Net Income Per Limited Partner Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Net Income Per Limited Partner Unit |  |  |  |
General partner ownership interest (as a percent) |  |  | 2.00% |
Basic Net Income per Limited Partner Unit |  |  |  |
Net income attributable to PAA | $ 249 | $ 323 | $ 657 | $ 994
Less: General partner's incentive distribution | (148) | (124) | (437) | (351)
Less: General partner 2% ownership | (2) | (4) | (5) | (13)
Net income attributable to limited partners | 99 | 195 | 215 | 630
Less: Undistributed earnings allocated and distributions to participating securities | (1) | (1) | (4) | (5)
Net income attributable to limited partners in accordance with application of the two-class method for MLPs | $ 98 | $ 194 | $ 211 | $ 625
Basic weighted average limited partner units outstanding | 398 | 370 | 393 | 365
Basic net income per limited partner unit | $ 0.25 | $ 0.52 | $ 0.54 | $ 1.71
Diluted Net Income per Limited Partner Unit |  |  |  |
Net income attributable to PAA | $ 249 | $ 323 | $ 657 | $ 994
Less: General partner's incentive distribution | (148) | (124) | (437) | (351)
Less: General partner 2% ownership | (2) | (4) | (5) | (13)
Net income attributable to limited partners | 99 | 195 | 215 | 630
Less: Undistributed earnings allocated and distributions to participating securities | (1) | (1) | (4) | (5)
Net income attributable to limited partners in accordance with application of the two-class method for MLPs | $ 98 | $ 194 | $ 211 | $ 625
Basic weighted average limited partner units outstanding | 398 | 370 | 393 | 365
Effect of dilutive securities: |  |  |  |
Weighted average LTIP units | 1 | 1 | 2 | 2
Diluted weighted average limited partner units outstanding | 399 | 371 | 395 | 367
Diluted net income per limited partner unit | $ 0.24 | $ 0.52 | $ 0.53 | $ 1.70

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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 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 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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