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Equity Indexed Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Share-based Compensation Arrangement, by Share-based Payment Award |  |  |  |
Equity-indexed compensation expense | $ 27 | $ 20 | $ 78 | $ 60
AAP LP Class B Units |  |  |  |
Share-based Compensation Arrangement, by Share-based Payment Award |  |  |  |
Equity-indexed compensation expense |  |  | 2 |
Reserved for Future Grants |  |  |  |
Reserved for future grants outstanding, beginning balance (in units) |  |  | 17,875 |
Unit granted (in units) |  |  | (4,500) |
Reserved for future grants outstanding, ending balance (in units) | 13,375 |  | 13,375 |
Outstanding |  |  |  |
Outstanding at the beginning of the period (in units) |  |  | 182,125 |
Unit granted (in units) |  |  | 4,500 |
Outstanding at the ending of the period (in units) | 186,625 |  | 186,625 |
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 |  | 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 |  |  | 7 |
Grant Date Fair Value of Outstanding Class B Units, ending balance | $ 51 |  | $ 51 |

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- Definition The number of outstanding awards on non-stock option plans for which the employer has issued equity instruments to an employee, including both employees who have and who have not yet satisfied service or performance criteria necessary to gain title to distributions to the shares. + References No definition available. + Details
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