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Partners' Capital (Cash Distributions) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May 15, 2018
Feb. 14, 2018
Mar. 31, 2018
Mar. 31, 2017
Distribution Made To Managing Member Or General Partner [Line Items]        
Per Unit Distribution (in dollars per share)   $ 0.8255    
Total Cash Distribution   $ 82    
Distribution to IDR Holders   $ 21 $ 18 $ 21
Subsequent Event [Member]        
Distribution Made To Managing Member Or General Partner [Line Items]        
Per Unit Distribution (in dollars per share) $ 0.8255      
Total Cash Distribution $ 68      
Distribution to IDR Holders $ 18