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Net Income per Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share Basic [Line Items]            
Net Income (Loss) Attributable to Parent $ 121 $ 216 $ 166 $ 154 $ 337 $ 320
Incentive distribution rights 18   18   36 36
Distributions on nonvested phantom unit awards $ 1   $ 1   $ 3 $ 3
Weighted average common units outstanding:            
Common - basic (in shares) 83,737,613   83,350,567   83,710,409 83,346,719
Common - diluted (in shares) 84,767,972   84,402,867   84,749,895 84,276,640
Basic $ 1.22   $ 1.76   $ 3.56 $ 3.37
Diluted $ 1.20   $ 1.73   $ 3.52 $ 3.33
Common Units [Member]            
Earnings Per Share Basic [Line Items]            
Limited partners’ interest in net income $ 102   $ 147   $ 298 $ 281
Weighted average common units outstanding:            
Common - basic (in shares) 83,737,613   83,350,567   83,710,409 83,346,719
Common - equivalents (in shares) 1,030,359   1,052,300   1,039,486 929,921
Common - diluted (in shares) 84,767,972   84,402,867   84,749,895 84,276,640