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Organization and Basis of Presentation (Details2) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 02, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 segment | Sep. 30, 2011
Organization and Basis of Presentation |  |  |  |  |
Operating segments number |  |  |  | 3 |
Unit split conversion ratio | 2 |  |  |  |
Partner Income Allocation |  |  |  |  |
General partner ownership interest (as a percent) |  |  |  | 2.00% |
Net Income Attributable to Plains |  | $ 165 | $ 281 | $ 774 | $ 688
Limited Partner |  |  |  |  |
Partner Income Allocation |  |  |  |  |
Limited partner ownership interest (as a percent) |  |  |  | 98.00% |
Net Income Attributable to Plains |  |  | 221 |  | 520
General Partner |  |  |  |  |
Partner Income Allocation |  |  |  |  |
General partner ownership interest (as a percent) |  |  |  | 2.00% |
Net Income Attributable to Plains |  |  | 60 |  | 168
Total Net Income Attributable to Plains |  |  |  |  |
Partner Income Allocation |  |  |  |  |
Net Income Attributable to Plains |  |  | 281 |  | 688
Amounts Previously Reported | Limited Partner |  |  |  |  |
Partner Income Allocation |  |  |  |  |
Net Income Attributable to Plains |  |  | 224 |  | 528
Amounts Previously Reported | General Partner |  |  |  |  |
Partner Income Allocation |  |  |  |  |
Net Income Attributable to Plains |  |  | $ 57 |  | $ 160

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