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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