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Net Income Per Limited Partner Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 02, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Net Income Per Limited Partner Unit |  |  |  |  |
Unit split conversion ratio | 2 |  |  |  |
General partner ownership interest (as a percent) |  |  |  | 2.00% |
Numerator for Basic and Diluted Net Income per Limited Partner Unit (prior period adjusted for stock split): |  |  |  |  |
Net income attributable to Plains |  | $ 165 | $ 281 | $ 774 | $ 688
Less: General partner's incentive distribution |  | (74) | (55) | (208) | (158)
Less: General partner 2% ownership |  | (2) | (5) | (12) | (10)
Net income available to limited partners |  | 89 | 221 | 554 | 520
Less: Undistributed earnings allocated and distributions to participating securities |  | (1) |  | (3) |
Net income available to limited partners in accordance with the application of the two-class method for MLPs |  | $ 88 | $ 221 | $ 551 | $ 520
Denominator for Basic and Diluted Net Income per Limited Partner Unit (prior period adjusted for stock split): |  |  |  |  |
Basic weighted average number of limited partner units outstanding (in units) |  | 329 | 299 | 322 | 294
Effect of dilutive securities (prior period adjusted for stock split): |  |  |  |  |
Weighted average LTIP units (in units) |  | 2 | 1 | 3 | 2
Diluted weighted average number of limited partner units outstanding (in units) |  | 331 | 300 | 325 | 296
Basic net income per limited partner unit (in dollars per unit) |  | $ 0.27 | $ 0.74 | $ 1.71 | $ 1.77
Diluted net income per limited partner unit (in dollars per unit) |  | $ 0.27 | $ 0.74 | $ 1.70 | $ 1.76

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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 This item represents the conversion ratio used in the calculation of a stock split. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 + 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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