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Equity-Indexed Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
AAP LP Class B Units
Oct. 21, 2013
AAP LP Class B Units
Subsequent Event
Share-based Compensation Arrangement, by Share-based Payment Award            
Equity-indexed compensation expense $ 17 $ 22 $ 96 $ 82 $ 4  
Reserved for Future Grants            
Reserved for future grants outstanding, beginning balance (in units)         17,875 3,483,102
Units granted (in units)         (4,500)  
Reserved for future grants outstanding, ending balance (in units)         13,375 3,483,102
Outstanding            
Outstanding at the beginning of the period (in units)         182,125 48,642,833
Units granted (in units)         4,500  
Outstanding at the ending of the period (in units)         186,625 48,642,833
Outstanding Units Earned            
Outstanding Units Earned, beginning balance (in units)         130,250 47,013,803
Units earned (in units)         50,125  
Outstanding Units Earned, end balance (in units)         180,375 47,013,803
Grant Date Fair Value of Outstanding Class B Units:            
Grant Date Fair Value of Outstanding Class B Units, beginning balance         44  
Units granted         7  
Grant Date Fair Value of Outstanding Class B Units, ending balance         $ 51