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Partners' Capital and Distributions (Details 5) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |  |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended |  | 0 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, 2012 PNG | 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 05, 2010 PNG IPO | Jun. 30, 2010 PNG IPO | May 05, 2010 PNG IPO Series A Subordinated Units | May 05, 2010 PNG IPO Series B Subordinated Units | Dec. 31, 2012 SLC Pipeline | May 05, 2010 PNGS | Apr. 30, 2010 PNGS
Partners Capital and Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests, ownership percentage of noncontrolling owners |  |  |  |  |  |  | 36.00% |  |  |  |  |  |  |  |  | 25.00% |  |
Number of common units issued representing limited partner interest (in units) |  |  |  |  |  |  |  |  |  |  |  | 13,478,000 | 13,500,000 |  |  |  |  |
Price per unit of common units issued |  |  |  |  |  |  |  |  |  |  |  | $ 21.50 |  |  |  |  |  |
Number of common units issued at closing of the IPO pursuant to the full exercise of the Underwriters's over-allotment option |  |  |  |  |  |  |  |  |  |  |  | 1,758,000 |  |  |  |  |  |
Net proceeds received by PNG from sale of common units |  |  |  |  |  |  |  |  |  |  |  | $ 268 | $ 268 |  |  |  |  |
Percent of equity represented by common units (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 23.00% |  |  |  |  |  |
Ownership interest in PNGS prior to IPO (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Equity interest in PNGS contributed to PNG (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Number of common units issued to Plains (in units) |  |  |  |  |  |  |  |  |  |  |  | 18,100,000 |  | 13,900,000 | 11,500,000 |  |  |
General Partner Interest in PNG (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Non-controlling interests associated with the book value of PNG sold to third parties |  |  |  | 370 | 268 |  |  |  |  |  |  | 167 |  |  |  |  |  |
Increase to partners' capital |  |  |  |  |  |  |  |  |  |  |  | $ 101 |  |  |  |  |  |
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 |  |  |  |  |  |  |
Units purchased (in units) |  |  | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common units transfer to noncontrolling interests in connection with the settlement of equity compensation awards (in shares) | (100,000) | (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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