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Partners' Capital and Distributions - Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Aug. 14, 2017
May 15, 2017
Feb. 14, 2017
Jun. 30, 2017
Jun. 30, 2016
Partners Capital and Distributions          
Total distributions paid       $ 771 $ 868
Partners’ Capital Excluding Noncontrolling Interests          
Partners Capital and Distributions          
Total distributions paid       $ 770 $ 866
Common Units | Cash Distributions          
Partners Capital and Distributions          
Total distributions paid   $ 399 $ 371    
Distributions per common unit, paid (usd per unit)   $ 0.55 $ 0.55    
Common Units | Cash Distributions | Forecast          
Partners Capital and Distributions          
Total distributions paid $ 399        
Distributions per common unit, paid (usd per unit) $ 0.55        
Series A Preferred Units | Partners’ Capital Excluding Noncontrolling Interests | In-Kind Distributions          
Partners Capital and Distributions          
Distributions to unitholders   $ 34 $ 34    
Distribution of units in lieu of cash (units)   1,313,527 1,287,773    
Series A Preferred Units | Partners’ Capital Excluding Noncontrolling Interests | In-Kind Distributions | Forecast          
Partners Capital and Distributions          
Distributions to unitholders $ 35        
Distribution of units in lieu of cash (units) 1,339,796        
Public | Common Units | Cash Distributions          
Partners Capital and Distributions          
Distributions to unitholders   $ 240 $ 237    
Public | Common Units | Cash Distributions | Forecast          
Partners Capital and Distributions          
Distributions to unitholders $ 240        
AAP | Common Units | Cash Distributions          
Partners Capital and Distributions          
Distributions to unitholders   $ 159 $ 134    
AAP | Common Units | Cash Distributions | Forecast          
Partners Capital and Distributions          
Distributions to unitholders $ 159