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Partners' Capital and Distributions - Schedule of Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Distribution Made to Limited Partner [Line Items]      
Total distributions paid $ 1,399 $ 1,631 $ 1,674
Cash Distribution      
Distribution Made to Limited Partner [Line Items]      
Total distributions paid   $ 1,627 $ 1,671
Common Units | Cash Distribution      
Distribution Made to Limited Partner [Line Items]      
Total distributions paid $ 1,386    
Distributions per common unit (in dollars per unit) $ 1.95 $ 2.65 $ 2.76
Public | Common Units | Cash Distribution      
Distribution Made to Limited Partner [Line Items]      
Distributions paid to limited partners $ 849 $ 1,062 $ 1,081
AAP | Cash Distribution      
Distribution Made to Limited Partner [Line Items]      
Distributions paid to General Partner   $ 565 $ 590
AAP | Common Units | Cash Distribution      
Distribution Made to Limited Partner [Line Items]      
Distributions paid to limited partners $ 537