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Equity Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 AAP LP Class B Units | Mar. 31, 2013 AAP LP Class B Units Maximum | Feb. 28, 2013 Class B Units of PNGS GP LLC | Jul. 31, 2010 Class B Units of PNGS GP LLC | Dec. 31, 2012 Class B Units of PNGS GP LLC
Share-based Compensation Arrangement, by Share-based Payment Award |  |  |  |  |  |  |
Equity compensation expense | $ 51 | $ 39 |  | $ 1 |  |  |
Authorized grants (in units) |  |  |  |  |  | 165,000 |
Units outstanding (in units) |  |  |  |  |  |  | 74,250
Units canceled (in units) |  |  |  |  | 74,250 |  |
Annualized distribution, low end of range (in dollars per unit) |  |  |  |  |  | $ 2.00 |
Annualized distribution, high end of range (in dollars per unit) |  |  |  |  |  | $ 2.70 |
Reserved for Future Grants |  |  |  |  |  |  |
Reserved for future grants outstanding, beginning balance (in units) |  |  | 17,875 |  |  |  |
Unit granted (in units) |  |  | (3,500) |  |  |  |
Reserved for future grants outstanding, ending balance (in units) |  |  | 14,375 |  |  |  |
Outstanding |  |  |  |  |  |  |
Outstanding at the beginning of the period (in units) |  |  | 182,125 |  |  |  |
Unit granted (in units) |  |  | 3,500 |  |  |  |
Outstanding at the ending of the period (in units) |  |  | 185,625 |  |  |  |
Outstanding Units Earned |  |  |  |  |  |  |
Outstanding Units Earned, beginning balance (in units) |  |  | 130,250 |  |  |  |
Units earned (in units) |  |  | 26,000 |  |  |  |
Outstanding Units Earned, end balance (in units) |  |  | 156,250 |  |  |  |
Grant Date Fair Value of Outstanding Class B Units: |  |  |  |  |  |  |
Grant Date Fair Value of Outstanding Class B Units, beginning balance |  |  | 44 |  |  |  |
Unit granted |  |  | 6 |  |  |  |
Grant Date Fair Value of Outstanding Class B Units, ending balance |  |  | $ 50 |  |  |  |

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