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(Deficit) Equity - Units Outstanding (Details)
3 Months Ended 9 Months Ended
Apr. 01, 2020
$ / shares
shares
Sep. 30, 2020
shares
Jun. 30, 2020
Sep. 30, 2020
shares
Dec. 31, 2019
shares
Changes In Units Outstanding [Roll Forward]          
Common unitholders' capital account, units outstanding (in shares)   393,289,537   393,289,537 233,289,537
Percent of consideration payable in cash 90.00%        
Common Units          
Changes In Units Outstanding [Roll Forward]          
Common unitholders' capital account, units outstanding (in shares)   123,832,233   123,832,233 123,832,233
Limited Partner | Partnership Interests Restructuring Agreement | Series A Perpetual Convertible Preferred Units          
Changes In Units Outstanding [Roll Forward]          
Unit distribution (in units) 50,782,904        
General Partner SPLC          
Changes In Units Outstanding [Roll Forward]          
Beginning balance (in shares)       4,761,012  
Unit distribution (in units)       (4,761,012)  
Ending balance (in shares)   0   0  
Units canceled (in units) 4,761,012        
General Partner SPLC | Economic Interest          
Changes In Units Outstanding [Roll Forward]          
Noncontrolling interest 2.00%   2.00%    
Preferred Partner          
Changes In Units Outstanding [Roll Forward]          
Beginning balance (in shares)       0  
Ending balance (in shares)   50,782,904   50,782,904  
Preferred Partner | Series A Perpetual Convertible Preferred Units          
Changes In Units Outstanding [Roll Forward]          
Conversion ratio 1        
Preferred Partner | Partnership Interests Restructuring Agreement | Series A Perpetual Convertible Preferred Units          
Changes In Units Outstanding [Roll Forward]          
Unit distribution (in units) 50,782,904     50,782,904  
General Public | Common Units          
Changes In Units Outstanding [Roll Forward]          
Beginning balance (in shares)       123,832,233  
Unit distribution (in units)       0  
Ending balance (in shares)   123,832,233   123,832,233  
Shell Pipeline Company L P | Series A Perpetual Convertible Preferred Units          
Changes In Units Outstanding [Roll Forward]          
Conversion ratio 1        
Closing price per share, threshold (in dollars per share) | $ / shares $ 33.082        
Closing price per share, percent of issuance price, threshold 140.00%        
Closing price per share, number of trading days threshold 20 days        
Closing price per share, number of trading days preceding notice of conversion 30 days        
Shell Pipeline Company L P | Common Units          
Changes In Units Outstanding [Roll Forward]          
Beginning balance (in shares)       109,457,304  
Unit distribution (in units)       160,000,000  
Ending balance (in shares)   269,457,304   269,457,304  
Common unitholders' capital account, units outstanding (in shares)   269,457,304   269,457,304 109,457,304
Shell Pipeline Company L P | Limited Partner | Limited Partner Interest          
Changes In Units Outstanding [Roll Forward]          
Ownership interest percentage   46.00%   68.50%  
Aggregate percentage of general partner interest     98.00%    
Shell Pipeline Company L P | General Partner SPLC | General Partner Interest          
Changes In Units Outstanding [Roll Forward]          
Aggregate percentage of general partner interest     2.00%