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Partners' Capital (Cash Distributions) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Nov. 19, 2020
Aug. 19, 2020
May 19, 2020
Feb. 19, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Distribution Made To Managing Member Or General Partner [Line Items]                
Per Unit Distribution (in dollars per share)   $ 0.8255 $ 0.8255 $ 0.8255        
Total Cash Distribution   $ 69 $ 69 $ 69     $ 264 $ 262
Distribution to IDR Holders   $ 18 $ 18 $ 18 $ 18 $ 18 $ 53 $ 53
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 $ 69              
Distribution to IDR Holders $ 18