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Net Income per Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Aug. 19, 2020
May 19, 2020
Feb. 19, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share Basic [Line Items]                      
Net Income (Loss) Attributable to Parent       $ 100 $ 157 $ (128) $ 66 $ 55 $ 109 $ 129 $ 230
Incentive distribution rights $ 18 $ 18 $ 18 18     18     53 53
Distributions on nonvested phantom unit awards       $ 1     $ 1     $ 5 5
Limited partners’ interest in net income                     $ 172
Weighted average common units outstanding:                      
Common - basic (in shares)       83,056,365     82,749,644     83,033,556 82,734,526
Common - diluted (in shares)       83,770,034     83,649,898     83,668,835 83,512,121
Common units - basic       $ 0.97     $ 0.57     $ 0.85 $ 2.09
Common units - diluted       $ 0.96     $ 0.57     $ 0.84 $ 2.07
Common Units [Member]                      
Earnings Per Share Basic [Line Items]                      
Limited partners’ interest in net income       $ 81     $ 47     $ 71 $ 172
Weighted average common units outstanding:                      
Common - basic (in shares)       83,056,365     82,749,644     83,033,556 82,734,526
Common - equivalents (in shares)       713,669     900,254     635,279 777,595
Common - diluted (in shares)       83,770,034     83,649,898     83,668,835 83,512,121