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Equity-Indexed Compensation Plans - AAP Management Units (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended 113 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Grant Date Fair Value of Outstanding AAP Management Units          
Equity-indexed compensation expense   $ 60 $ 27 $ 98  
AAP Management Units          
Equity-Indexed Compensation Plans          
Modified in period (in units) 800,000        
Number of units available for grant (in units)   0     0
Unearned units   800,000     800,000
Outstanding          
Outstanding, beginning balance (in units)   19,000,000 18,400,000    
Granted (in units)     600,000    
Converted (in units)   (15,600,000)      
Outstanding, ending balance (in units)   3,400,000 19,000,000 18,400,000 3,400,000
Outstanding Units Earned          
Outstanding Units Earned, beginning balance (in units)   18,200,000 17,900,000    
Earned (in units)     300,000    
Converted (in units)   (15,600,000)      
Outstanding Units Earned, ending balance (in units)   2,600,000 18,200,000 17,900,000 2,600,000
Grant Date Fair Value of Outstanding AAP Management Units          
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance   $ 88 $ 64    
Granted     24    
Modified   (17)      
Converted   (36)      
Grant Date Fair Value of Outstanding AAP Management Units, ending balance   35 88 $ 64 $ 35
Equity-indexed compensation expense   $ 2 $ 1 $ 7 $ 22
AAP Management Units | Minimum          
Equity-Indexed Compensation Plans          
Annualized distribution level required for units to become earned (in dollars per unit) $ 2.20        
AAP Management Units | Maximum          
Equity-Indexed Compensation Plans          
Annualized distribution level required for units to become earned (in dollars per unit) $ 2.40        
Conversion Of Aap Management Units Into Aap Units          
Equity-Indexed Compensation Plans          
Unit conversion ratio   0.941     0.941
AAP | AAP Management Units          
Equity-Indexed Compensation Plans          
Equivalent distribution entitled to be received when earned (as a percent)   94.10%     94.10%
AAP          
Equity-Indexed Compensation Plans          
Units To Be Issued   0.941     0.941