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Equity-Indexed Compensation Plans (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 86 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
AAP Management Units
Sep. 30, 2014
AAP Management Units
Reserved for Future Grants            
Reserved for future grants, beginning balance (in units)         3.5  
Granted (in units)         (0.4)  
Reserved for future grants, ending balance (in units)         3.1 3.1
Outstanding            
Outstanding, beginning balance (in units)         48.6  
Granted (in units)         0.4  
Outstanding, ending balance (in units)         49.0 49.0
Outstanding Units Earned            
Outstanding Units Earned, beginning balance (in units)         47.0  
Earned (in units)         0.8  
Outstanding Units Earned, ending balance (in units)         47.8 47.8
Grant Date Fair Value of Outstanding AAP Management Units            
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance         $ 51  
Granted         11  
Grant Date Fair Value of Outstanding AAP Management Units, ending balance         62 62
Equity-indexed compensation expense $ 22 $ 17 $ 90 $ 96 $ 5 $ 54