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Equity - Units Outstanding (Details) - shares
3 Months Ended
Mar. 29, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Class of Stock [Line Items]        
Limited partners' capital account, units outstanding (in units)   177,317,444    
Capital units, publicly owned (in units)   180,936,167   180,936,167
Ownership interest (in percentage)   49.20%    
Aggregate percentage of general partner interest   2.00%    
Common Units | General Public        
Class of Stock [Line Items]        
Limited partners' capital account, units outstanding (in units)   88,367,308   88,367,308
Capital units, publicly owned (in units)   88,367,308   88,367,308
Common Units | Shell Pipeline Company L P        
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
General Partner        
Class of Stock [Line Items]        
Capital units, publicly owned (in units)   3,618,723   3,618,723
Aggregate percentage of general partner interest 2.00% 2.00% 2.00%