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Organization and Basis of Presentation (Details 2) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 9 Months Ended |  | 9 Months Ended | 0 Months Ended | 9 Months Ended |  | 0 Months Ended |
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Aug. 14, 2013 | May 15, 2013 | Feb. 14, 2013 | Nov. 14, 2013 Subsequent Event Third Quarter Distribution | Sep. 30, 2013 Subsequent Event Third Quarter Distribution | Sep. 30, 2013 PNG | Sep. 30, 2013 PNG Subordinated units | Nov. 14, 2013 PNG Subsequent Event Third Quarter Distribution | Sep. 30, 2013 PNG Subsequent Event Third Quarter Distribution | Sep. 30, 2013 PNG General Partner | Sep. 30, 2013 Common Units PNG | Oct. 22, 2013 Merger Agreement Subsequent Event | Oct. 22, 2013 Merger Agreement Subsequent Event General partner
Potential Acquisition of Publicly-held Common Units of PNG |  |  |  |  |  |  |  |  |  |  |  |  |
Number of PAA common units issuable for each outstanding common unit of PNG |  |  |  |  |  |  |  |  |  |  |  | 0.445 |
PNG units not owned by PAA (in units) |  |  |  |  |  |  |  |  |  |  |  | 33,000,000 |
PAA common units expected to be issued in exchange for outstanding PNG common units |  |  |  |  |  |  |  |  |  |  |  | 14,700,000 |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  | 46.00% |  |
Ownership interest (as a percent) |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |
Outstanding units (in shares) |  |  |  |  |  | 61,200,000 |  |  |  |  |  |  |
Quarterly Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distributions per common unit (in dollars per unit) | $ 0.5875 | $ 0.5750 | $ 0.5625 | $ 0.6000 |  |  |  | $ 0.3575 |  |  |  |  |
Unitholders of record, date |  |  |  |  | Nov. 01, 2013 |  |  |  | Nov. 01, 2013 |  |  |  |
Reduction in incentive distribution rights |  |  |  |  |  |  |  |  |  |  |  |  |
2014 |  |  |  |  |  |  |  |  |  |  |  |  | $ 12
2015 |  |  |  |  |  |  |  |  |  |  |  |  | 12
2016 |  |  |  |  |  |  |  |  |  |  |  |  | 10
Thereafter |  |  |  |  |  |  |  |  |  |  |  |  | $ 5

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