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Equity-Indexed Compensation Plans (Details 2) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 98 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Grant Date Fair Value of Outstanding AAP Management Units        
Equity-indexed compensation expense $ 22 $ 27 $ 90  
AAP Management Units        
Reserved for Future Grants        
Reserved for future grants, beginning balance (in units)   3.0    
Granted (in units)   (1.6)    
Reserved for future grants, ending balance (in units)   1.4   1.4
Outstanding        
Outstanding, beginning balance (in units)   49.1    
Granted (in units)   1.6    
Outstanding, ending balance (in units)   50.7   50.7
Outstanding Units Earned        
Outstanding Units Earned, beginning balance (in units)   47.8    
Earned (in units)   0.7    
Outstanding Units Earned, ending balance (in units)   48.5   48.5
Grant Date Fair Value of Outstanding AAP Management Units        
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance   $ 64    
Granted   24    
Grant Date Fair Value of Outstanding AAP Management Units, ending balance   88   $ 88
Equity-indexed compensation expense   $ 1   $ 57