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Equity-Indexed Compensation Plans (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 83 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
AAP Management Units
Jun. 30, 2014
AAP Management Units
Reserved for Future Grants            
Reserved for future grants outstanding, beginning balance (in units)         3.5  
Units granted (in units)         (0.4)  
Reserved for future grants outstanding, ending balance (in units)         3.1 3.1
Outstanding            
Outstanding, beginning balance (in units)         48.6  
Units 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  
Units 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  
Units granted         11  
Grant Date Fair Value of Outstanding AAP Management Units, ending balance         62 62
Equity-indexed compensation expense $ 34 $ 27 $ 68 $ 78 $ 4 $ 52