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(Deficit) Equity - Schedule of Distributions Declared and/or Paid (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2020
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2018
Distribution Made To Limited Partner [Line Items]                
Distributions declared and/or paid   $ 173 $ 173 $ 173 $ 173 $ 162 $ 162  
Distributions paid per limited partner unit (in dollars per share)   $ 0.4600 $ 0.4600 $ 0.4600 $ 0.4600 $ 0.4600 $ 0.4600  
Dilutive effect of preferred units   $ 12            
Preferred Units                
Distribution Made To Limited Partner [Line Items]                
Distributions paid per limited partner unit (in dollars per share) $ 0.2363              
Shell Midstream Partners L.P.                
Distribution Made To Limited Partner [Line Items]                
Aggregate percentage of general partner interest     2.00%         2.00%
Zydeco Pipeline Company LLC (“Zydeco”)                
Distribution Made To Limited Partner [Line Items]                
Distributions to noncontrolling interest           $ 1    
Odyssey Pipeline L.L.C. (“Odyssey”)                
Distribution Made To Limited Partner [Line Items]                
Distributions to noncontrolling interest   4       4    
Common Units | General Public                
Distribution Made To Limited Partner [Line Items]                
Distributions declared and/or paid   57 $ 57 $ 57 $ 57 57 $ 57  
Common Units | Shell Pipeline Company L P                
Distribution Made To Limited Partner [Line Items]                
Distributions declared and/or paid   104 104 104 104 50 50  
Preferred Units | Shell Pipeline Company L P                
Distribution Made To Limited Partner [Line Items]                
Distributions declared and/or paid   12 12 12 12 0 0  
General Partner SPLC                
Distribution Made To Limited Partner [Line Items]                
Distributions declared and/or paid   0 0 0 0 3 3  
General Partner SPLC | Partnership Interests Restructuring Agreement                
Distribution Made To Limited Partner [Line Items]                
Distributions payable, amount waved $ 20              
General Partner SPLC | IDR's                
Distribution Made To Limited Partner [Line Items]                
Distributions declared and/or paid   $ 0 $ 0 $ 0 $ 0 $ 52 $ 52  
Limited Partner | Partnership Interests Restructuring Agreement | Common Units                
Distribution Made To Limited Partner [Line Items]                
Unit distribution (in units) 160,000,000