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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 | 12 Months Ended
--- | --- | --- | ---
Oct. 02, 2012 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Basic and Diluted Earnings Per Limited Partner Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 320 | $ 165 | $ 378 | $ 230 | $ 278 | $ 281 | $ 225 | $ 182 | $ 1,094 | $ 966 | $ 505
Net income available to limited partners |  |  |  |  |  |  |  |  |  | 789 | 730 | 330
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) |  |  |  |  |  |  |  |  |  | 325 | 297 | 274
Effect of dilutive securities (prior period adjusted for stock split): |  |  |  |  |  |  |  |  |  |  |  |
Weighted average LTIP units (in units) |  |  |  |  |  |  |  |  |  | 3 | 2 | 1
Diluted weighted average number of limited partner units outstanding (in units) |  |  |  |  |  |  |  |  |  | 328 | 299 | 275
Basic and Diluted Net Income per Limited Partner Unit |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per limited partner unit (in dollars per unit) |  | $ 0.70 | $ 0.27 | $ 0.93 | $ 0.52 | $ 0.69 | $ 0.74 | $ 0.57 | $ 0.45 | $ 2.41 | $ 2.46 | $ 1.21
Diluted net income per limited partner unit (in dollars per unit) |  | $ 0.69 | $ 0.27 | $ 0.93 | $ 0.51 | $ 0.68 | $ 0.74 | $ 0.57 | $ 0.45 | $ 2.40 | $ 2.44 | $ 1.20
Basic Net Income Per Limited Partner Unit |  |  |  |  |  |  |  |  |  |  |  |
Numerator for Basic and Diluted Net Income per Limited Partner Unit (prior period adjusted for stock split): |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Plains |  |  |  |  |  |  |  |  |  | 1,094 | 966 | 505
Less: General partner's incentive distribution |  |  |  |  |  |  |  |  |  | (289) | (221) | (168)
Less: General partner 2% ownership |  |  |  |  |  |  |  |  |  | (16) | (15) | (7)
Net income available to limited partners |  |  |  |  |  |  |  |  |  | 789 | 730 | 330
Less: Undistributed earnings allocated and distributions to participating securities |  |  |  |  |  |  |  |  |  | (5) |  |
Net income available to limited partners in accordance with the application of the two-class method for MLPs |  |  |  |  |  |  |  |  |  | 784 | 730 | 330
Diluted Net Income Per Limited Partner Unit |  |  |  |  |  |  |  |  |  |  |  |
Numerator for Basic and Diluted Net Income per Limited Partner Unit (prior period adjusted for stock split): |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Plains |  |  |  |  |  |  |  |  |  | 1,094 | 966 | 505
Less: General partner's incentive distribution |  |  |  |  |  |  |  |  |  | (289) | (221) | (168)
Less: General partner 2% ownership |  |  |  |  |  |  |  |  |  | (16) | (15) | (7)
Net income available to limited partners |  |  |  |  |  |  |  |  |  | 789 | 730 | 330
Less: Undistributed earnings allocated and distributions to participating securities |  |  |  |  |  |  |  |  |  | (4) |  |
Net income available to limited partners in accordance with the application of the two-class method for MLPs |  |  |  |  |  |  |  |  |  | $ 785 | $ 730 | $ 330

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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 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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- 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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