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(Deficit) Equity - Schedule of Distributions Declared and/or Paid (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Apr. 01, 2020
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Distribution Made To Limited Partner [Line Items]                                  
Distributions per Limited Partner unit (in dollars per share)   $ 0.46000 $ 0.46000 $ 0.46000 $ 0.46000 $ 0.46000 $ 0.44500 $ 0.43000 $ 0.41500 $ 0.40000 $ 0.38200 $ 0.36500 $ 0.34800 $ 0.33300 $ 1.8400 $ 1.7500 $ 1.4950
Preferred unitholder’s interest in net income   $ 36                         $ 36 $ 0 $ 0
Distribution to holders of incentive distribution rights waived     $ 16 $ 17 $ 17                   $ 50    
Distributions declared and/or paid   173 173 173 162 $ 162 $ 140 $ 131 $ 119 $ 129 $ 121 $ 113 $ 106 $ 83      
Preferred Units                                  
Distribution Made To Limited Partner [Line Items]                                  
Distributions per Limited Partner unit (in dollars per share) $ 0.2363                           $ 0.7089    
Shell Midstream Partners L.P.                                  
Distribution Made To Limited Partner [Line Items]                                  
Aggregate percentage of interest                             200.00%    
Common Units | General Public                                  
Distribution Made To Limited Partner [Line Items]                                  
Distributions declared and/or paid   57 57 57 57 57 56 53 51 49 47 46 43 33      
Unit distribution (in units)                             0    
Common Units | Shell Pipeline Company L P                                  
Distribution Made To Limited Partner [Line Items]                                  
Distributions declared and/or paid   104 104 104 50 50 48 47 42 40 38 36 35 30      
Unit distribution (in units)                             160,000,000    
General Partner SPLC                                  
Distribution Made To Limited Partner [Line Items]                                  
Distributions declared and/or paid   $ 0 0 0 3 3 3 3 3 3 3 2 2 2      
Unit distribution (in units)                             (4,761,012)    
General Partner SPLC | Partnership Interests Restructuring Agreement                                  
Distribution Made To Limited Partner [Line Items]                                  
Distributions payable, amount waved $ 20                                
General Partner SPLC | Economic Interest                                  
Distribution Made To Limited Partner [Line Items]                                  
Noncontrolling interest   2.00%                         2.00%    
General Partner SPLC | General Partner IDR's                                  
Distribution Made To Limited Partner [Line Items]                                  
Distributions declared and/or paid   $ 0 0 0 52 52 33 28 23 37 33 29 26 18      
Preferred Units | Shell Pipeline Company L P                                  
Distribution Made To Limited Partner [Line Items]                                  
Distributions declared and/or paid   $ 12 $ 12 $ 12 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0