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Net Income Per Limited Partner Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Basic and Diluted Net Income Per Limited Partner Unit |  |  |  |
General partner ownership interest (as a percent) | 2.00% | 2.00% | 2.00% | 2.00%
Numerator for Basic and Diluted Net Income per Limited Partner Unit: |  |  |  |
Net income attributable to Plains | $ 292 | $ 378 | $ 821 | $ 609
Net income available to limited partners | 197 | 303 | 631 | 465
Denominator for Basic and Diluted Net Income per Limited Partner Unit: |  |  |  |
Basic weighted average number of limited partner units outstanding (in units) | 340 | 323 | 338 | 319
Effect of dilutive securities: |  |  |  |
Weighted average LTIP units (in units) | 2 | 3 | 3 | 2
Diluted weighted average number of limited partner units outstanding (in units) | 342 | 326 | 341 | 321
Basic and Diluted Net Income per Limited Partner Unit |  |  |  |
Basic net income per limited partner unit (in dollars per unit) | $ 0.58 | $ 0.93 | $ 1.85 | $ 1.45
Diluted net income per limited partner unit (in dollars per unit) | $ 0.57 | $ 0.93 | $ 1.84 | $ 1.44
Basic Net Income Per Limited Partner Unit |  |  |  |
Numerator for Basic and Diluted Net Income per Limited Partner Unit: |  |  |  |
Net income attributable to Plains | 292 | 378 | 821 | 609
Less: General partner's incentive distribution | (91) | (69) | (177) | (134)
Less: General partner 2% ownership | (4) | (6) | (13) | (10)
Net income available to limited partners | 197 | 303 | 631 | 465
Less: Undistributed earnings allocated and distributions to participating securities | (1) | (2) | (5) | (3)
Net income available to limited partners in accordance with the application of the two-class method for MLPs | 196 | 301 | 626 | 462
Diluted Net Income Per Limited Partner Unit |  |  |  |
Numerator for Basic and Diluted Net Income per Limited Partner Unit: |  |  |  |
Net income attributable to Plains | 292 | 378 | 821 | 609
Less: General partner's incentive distribution | (91) | (69) | (177) | (134)
Less: General partner 2% ownership | (4) | (6) | (13) | (10)
Net income available to limited partners | 197 | 303 | 631 | 465
Less: Undistributed earnings allocated and distributions to participating securities | (1) | (1) | (3) | (2)
Net income available to limited partners in accordance with the application of the two-class method for MLPs | $ 196 | $ 302 | $ 628 | $ 463

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- Definition The number of units or percentage investment held by the managing member or general partner of the LLC or LP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Net income (loss) allocated to each outstanding 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=6959260&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 Net Income or Loss allocated to each limited partner unit outstanding during the reporting period and each unit that would have been outstanding assuming the issuance of limited partner units for all dilutive potential units outstanding during the reporting period. Limited partners have limited liability and do not manage the partnership. + 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=6959260&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 general 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=6959260&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=6959260&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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