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Equity (Deficit) - Schedule of Distributions Declared and/or Paid (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Feb. 06, 2018
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Distribution Made To Limited Partner [Line Items]              
Aggregate percentage of general partner interest             2.00%
Distributions declared and/or paid   $ 119 $ 129 $ 113 $ 106 $ 83 $ 121
Distributions paid per limited partner unit (in dollars per share)   $ 0.415 $ 0.40000 $ 0.36500 $ 0.348 $ 0.33300 $ 0.38200
Common Units | General Public              
Distribution Made To Limited Partner [Line Items]              
Distributions declared and/or paid   $ 51 $ 49 $ 45 $ 43 $ 33 $ 47
Common Units | Shell Pipeline Company L P              
Distribution Made To Limited Partner [Line Items]              
Distributions declared and/or paid   $ 42 40 36 35 30 38
General Partner              
Distribution Made To Limited Partner [Line Items]              
Aggregate percentage of general partner interest   2.00%          
Distributions declared and/or paid   $ 3 3 2 2 2 3
General Partner | Shell Pipeline Company L P              
Distribution Made To Limited Partner [Line Items]              
Aggregate percentage of general partner interest 2.00% 2.00%          
General Partner | IDR's              
Distribution Made To Limited Partner [Line Items]              
Distributions declared and/or paid   $ 23 $ 37 $ 30 $ 26 $ 18 $ 33