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(Deficit) Equity - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 06, 2018
Dec. 31, 2020
Apr. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]          
Partners' capital   $ (481)   $ (775)  
General Partner SPLC          
Class of Stock [Line Items]          
Units canceled (in units)   0   4,761,012 4,567,588
Partners' capital     $ (4,000)    
Units issued in connection with private placement (in units) 225,091        
General Partner SPLC | Shell Pipeline Company L P | General Partner Interest          
Class of Stock [Line Items]          
Aggregate percentage of interest 2.00% 2.00%      
Limited Partner | Shell Pipeline Company L P | Limited Partner Interest          
Class of Stock [Line Items]          
Aggregate percentage of interest   98.00%      
Common Units          
Class of Stock [Line Items]          
Units issued in connection with private placement (in units) 11,029,412 1,000,000,000      
Common Units | Shell Pipeline Company L P          
Class of Stock [Line Items]          
Units canceled (in units)   269,457,304   109,457,304 99,979,548