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(Deficit) Equity - Units Outstanding (Details)
3 Months Ended 6 Months Ended
Apr. 01, 2020
$ / shares
shares
Jun. 30, 2020
shares
Mar. 31, 2020
shares
Jun. 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          
Changes In Units Outstanding [Roll Forward]          
Beginning balance (in shares)     4,761,012 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 | 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 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)     123,832,233 123,832,233  
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)     109,457,304 109,457,304  
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          
Changes In Units Outstanding [Roll Forward]          
Ownership interest percentage       68.50%  
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 | General Partner Interest          
Changes In Units Outstanding [Roll Forward]          
Aggregate percentage of general partner interest     2.00%