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(Deficit) Equity - Units Outstanding (Details) - shares
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]    
Common unitholders' capital account, units outstanding (in shares) 233,289,537 233,289,537
General Partner    
Class of Stock [Line Items]    
Capital units, publicly owned (in shares) 4,761,012  
General Partner | General Partner Interest    
Class of Stock [Line Items]    
Aggregate percentage of general partner interest 2.00%  
General Public | Common Units    
Class of Stock [Line Items]    
Common unitholders' capital account, units outstanding (in shares) 123,832,233 123,832,233
Capital units, publicly owned (in shares) 123,832,233  
Shell Pipeline Company L P | Common Units    
Class of Stock [Line Items]    
Common unitholders' capital account, units outstanding (in shares) 109,457,304 109,457,304
Capital units, publicly owned (in shares) 109,457,304  
Shell Pipeline Company L P | Limited Partner | Limited Partner Interest    
Class of Stock [Line Items]    
Ownership interest percentage 46.00%  
Aggregate percentage of general partner interest 98.00%  
Shell Pipeline Company L P | General Partner | General Partner Interest    
Class of Stock [Line Items]    
Aggregate percentage of general partner interest 2.00%