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Partners' Capital and Distributions - Distributions, Class A (Details) - Class A Shares - USD ($)
$ / shares in Units, $ in Millions
Aug. 14, 2017
May 15, 2017
Feb. 14, 2017
Distributions      
Distributions to Class A Shareholders   $ 84 $ 57
Distribution per Class A share, paid (usd per share)   $ 0.55 $ 0.55
Forecast      
Distributions      
Distributions to Class A Shareholders $ 84    
Distribution per Class A share, paid (usd per share) $ 0.55