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Equity-Indexed Compensation Plans (Details 2) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 95 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015
Grant Date Fair Value of Outstanding AAP Management Units |  |  |  |  |
Equity-indexed compensation expense | $ 17 | $ 34 | $ 36 | $ 68 |
AAP Management Units |  |  |  |  |
Reserved for Future Grants |  |  |  |  |
Reserved for future grants, beginning balance (in units) |  |  | 3.0 |  |
Reserved for future grants, ending balance (in units) | 3.0 |  | 3.0 |  | 3.0
Outstanding |  |  |  |  |
Outstanding, beginning balance (in units) |  |  | 49.1 |  |
Outstanding, ending balance (in units) | 49.1 |  | 49.1 |  | 49.1
Outstanding Units Earned |  |  |  |  |
Outstanding Units Earned, beginning balance (in units) |  |  | 47.8 |  |
Earned (in units) |  |  | 0.4 |  |
Outstanding Units Earned, ending balance (in units) | 48.2 |  | 48.2 |  | 48.2
Grant Date Fair Value of Outstanding AAP Management Units |  |  |  |  |
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance |  |  | $ 64 |  |
Grant Date Fair Value of Outstanding AAP Management Units, ending balance | $ 64 |  | 64 |  | $ 64
Equity-indexed compensation expense |  |  | $ 1 |  | $ 57

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