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Partners' Capital and Distributions (Details 7) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  |  |
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May 31, 2012 | May 31, 2011 | Feb. 28, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 Common Units | Dec. 31, 2010 Common Units | Dec. 31, 2012 PNG Series A Subordinated Units | Dec. 31, 2010 PNG Series A Subordinated Units | Dec. 31, 2012 PNG Series B Subordinated Units | Dec. 31, 2010 PNG Series B Subordinated Units | May 31, 2012 PNG Common Units | May 31, 2011 PNG Common Units | Feb. 28, 2011 PNG Common Units | Dec. 31, 2012 PNG Common Units | Dec. 31, 2010 PNG Common Units | May 31, 2012 PNG Private Placement | May 31, 2011 PNG Private Placement | Feb. 28, 2011 PNG Private Placement | Dec. 31, 2012 PNG Private Placement | Dec. 31, 2011 PNG Private Placement | Dec. 31, 2010 PNG Private Placement | Apr. 30, 2010 PNGS
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued representing limited partner interest (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,400,000 |  |  |  |
Net proceeds from private placement on PNG common units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 370 |  |  |  |
Proceeds received by PNG from Plains for sale of common units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 230 |  |  |  |
Contribution from general partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |
Number of common units transfer to noncontrolling interests in connection with the settlement of equity compensation awards (in shares) | (100,000) | (100,000) |  |  |  |  |  |  |  |  |  |  | (100,000) | (100,000) |  |  |  | (58,672) | (58,672) |  |  |  |  |
Noncontrolling Interest, Ownership interest of reporting entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64.00% | 64.00% | 77.00% | 100.00%
Number of common units issued to Plains (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,200,000 |  |  |  |
General Partner Interest in PNG (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |
PNG units owned by PAA (in units) |  |  |  |  | 43,500,000 | 53,600,000 |  |  | 11,900,000 | 11,900,000 | 13,500,000 | 13,500,000 |  |  |  | 28,200,000 | 18,100,000 |  |  |  |  |  |  |
Units purchased (in units) |  |  | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  | 10,200,000 |  |  |  |  |  |  |  |  |
Non-controlling interests associated with the book value of PNG sold to third parties |  |  |  | 370 | 268 |  | 63 | 99 |  |  |  |  |  |  |  |  |  |  |  | 306 |  |  |  |
Increase to partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64 |  |  |  |

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