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(Deficit) Equity - Units Outstanding (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
Capital units, publicly owned (in units) 191,614,662 180,936,167 154,941,269
Aggregate percentage of interest 2.00%    
Common Units      
Class of Stock [Line Items]      
Limited partners' capital account, units outstanding (in units) 187,782,369    
General Partner      
Class of Stock [Line Items]      
Capital units, publicly owned (in units) 3,832,293 3,618,723 3,098,825
General Public | Common Units      
Class of Stock [Line Items]      
Limited partners' capital account, units outstanding (in units) 98,832,233 88,367,308  
Capital units, publicly owned (in units) 98,832,233 88,367,308 62,892,308
Shell Pipeline Company L P      
Class of Stock [Line Items]      
General partners' capital account, units outstanding (in units) 3,832,293 3,618,723  
Shell Pipeline Company L P | Common Units      
Class of Stock [Line Items]      
Limited partners' capital account, units outstanding (in units) 88,950,136 21,475,068  
Capital units, publicly owned (in units) 88,950,136 21,475,068 21,475,068
Shell Pipeline Company L P | Limited Partners' Common Units      
Class of Stock [Line Items]      
Ownership interest (in percentage) 46.40%    
Shell Pipeline Company L P | General Partner      
Class of Stock [Line Items]      
General partners' capital account, units outstanding (in units) 3,832,293    
Aggregate percentage of interest 2.00%    
Shell Pipeline Company L P | General Partner | May 2016 Acquisition      
Class of Stock [Line Items]      
Aggregate percentage of interest 2.00%