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Equity-Indexed Compensation Plans - AAP Management Units (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended | 113 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016
Grant Date Fair Value of Outstanding AAP Management Units |  |  |  |  |
Equity-indexed compensation expense |  | $ 60 | $ 27 | $ 98 |
AAP Management Units |  |  |  |  |
Equity-Indexed Compensation Plans |  |  |  |  |
Modified in period (in units) | 800,000 |  |  |  |
Number of units available for grant (in units) |  | 0 |  |  | 0
Unearned units |  | 800,000 |  |  | 800,000
Outstanding |  |  |  |  |
Outstanding, beginning balance (in units) |  | 19,000,000 | 18,400,000 |  |
Granted (in units) |  |  | 600,000 |  |
Converted (in units) |  | (15,600,000) |  |  |
Outstanding, ending balance (in units) |  | 3,400,000 | 19,000,000 | 18,400,000 | 3,400,000
Outstanding Units Earned |  |  |  |  |
Outstanding Units Earned, beginning balance (in units) |  | 18,200,000 | 17,900,000 |  |
Earned (in units) |  |  | 300,000 |  |
Converted (in units) |  | (15,600,000) |  |  |
Outstanding Units Earned, ending balance (in units) |  | 2,600,000 | 18,200,000 | 17,900,000 | 2,600,000
Grant Date Fair Value of Outstanding AAP Management Units |  |  |  |  |
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance |  | $ 88 | $ 64 |  |
Granted |  |  | 24 |  |
Modified |  | (17) |  |  |
Converted |  | (36) |  |  |
Grant Date Fair Value of Outstanding AAP Management Units, ending balance |  | 35 | 88 | $ 64 | $ 35
Equity-indexed compensation expense |  | $ 2 | $ 1 | $ 7 | $ 22
AAP Management Units | Minimum |  |  |  |  |
Equity-Indexed Compensation Plans |  |  |  |  |
Annualized distribution level required for units to become earned (in dollars per unit) | $ 2.20 |  |  |  |
AAP Management Units | Maximum |  |  |  |  |
Equity-Indexed Compensation Plans |  |  |  |  |
Annualized distribution level required for units to become earned (in dollars per unit) | $ 2.40 |  |  |  |
Conversion Of Aap Management Units Into Aap Units |  |  |  |  |
Equity-Indexed Compensation Plans |  |  |  |  |
Unit conversion ratio |  | 0.941 |  |  | 0.941
AAP | AAP Management Units |  |  |  |  |
Equity-Indexed Compensation Plans |  |  |  |  |
Equivalent distribution entitled to be received when earned (as a percent) |  | 94.10% |  |  | 94.10%
AAP |  |  |  |  |
Equity-Indexed Compensation Plans |  |  |  |  |
Units To Be Issued |  | 0.941 |  |  | 0.941

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