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Equity Compensation Plans (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Grant Date Fair Value of Outstanding Class B Units:      
Expense recognized $ 110 $ 98 $ 68
AAP LP Class B Units
      
Reserved for Future Grants      
Reserved for future grants outstanding, beginning balance (in units) 24,500    
Unit issuance (in units) (8,000)    
Reserved for future grants outstanding, ending balance (in units) 16,500 24,500  
Outstanding      
Outstanding at beginning of period (in units) 175,500    
Unit issuance (in units) 8,000    
Outstanding at end of period (in units) 183,500 175,500  
Outstanding Units Earned      
Outstanding Units Earned, beginning balance (in units) 80,063    
Outstanding at end of period (in units) 80,063 80,063  
Grant Date Fair Value of Outstanding Class B Units:      
Grant Date Fair Value of Outstanding Class B Units, beginning balance 40    
Units issued 4    
Grant Date Fair Value of Outstanding Class B Units, ending balance 44 40  
Expense recognized $ 9 $ 9