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Equity-Indexed Compensation Plans - AAP Management Units (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended 101 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Grant Date Fair Value of Outstanding AAP Management Units        
Equity-indexed compensation expense $ 27 $ 98 $ 116  
AAP Management Units        
Equity-Indexed Compensation Plans        
Authorized grants (in units) 52.1     52.1
Unearned units outstanding (in units) 2.2     2.2
Increments in which units become earned after achievement of target distribution level (as a percent) 25.00%      
Number of days after achievement of target distribution level that units become earned, in some cases 180 days      
Maximum participation in excess of distribution (as a percent) 8.00%      
Threshold for participation in distributions $ 11      
Reserved for Future Grants        
Reserved for future grants, beginning balance (in units) 3.0 3.5    
Granted (in units) (1.6) (0.5)    
Reserved for future grants, ending balance (in units) 1.4 3.0 3.5 1.4
Outstanding        
Outstanding, beginning balance (in units) 49.1 48.6    
Granted (in units) 1.6 0.5    
Outstanding, ending balance (in units) 50.7 49.1 48.6 50.7
Outstanding Units Earned        
Outstanding Units Earned, beginning balance (in units) 47.8 47.0    
Earned (in units) 0.7 0.8    
Outstanding Units Earned, ending balance (in units) 48.5 47.8 47.0 48.5
Grant Date Fair Value of Outstanding AAP Management Units        
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance $ 64 $ 51    
Granted 24 13    
Grant Date Fair Value of Outstanding AAP Management Units, ending balance 88 64 $ 51 $ 88
Equity-indexed compensation expense $ 1 $ 7 $ 5 $ 56
AAP Management Units | Minimum        
Equity-Indexed Compensation Plans        
Annualized distribution level required for currently unearned units to become earned (in dollars per unit) $ 2.85      
AAP Management Units | Maximum        
Equity-Indexed Compensation Plans        
Annualized distribution level required for currently unearned units to become earned (in dollars per unit) $ 3.50