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Equity - Units Outstanding (Details) - shares
3 Months Ended 6 Months Ended
Jun. 09, 2016
Mar. 29, 2016
Jun. 30, 2017
Mar. 31, 2016
Jun. 30, 2017
Dec. 31, 2016
Class of Stock [Line Items]            
Limited partners' capital account, units outstanding (in units)     177,412,369   177,412,369  
Capital units, publicly owned (in units)     181,033,030   181,033,030 180,936,167
Ownership interest (in percentage)         49.10%  
Aggregate percentage of general partner interest         2.00%  
General Partner            
Class of Stock [Line Items]            
Capital units, publicly owned (in units)     3,620,661   3,620,661 3,618,723
Aggregate percentage of general partner interest 2.00% 2.00% 2.00% 2.00% 2.00%  
General Public | Common Units            
Class of Stock [Line Items]            
Limited partners' capital account, units outstanding (in units)     88,462,233   88,462,233 88,367,308
Capital units, publicly owned (in units)     88,462,233   88,462,233 88,367,308
Shell Pipeline Company L P | Common Units            
Class of Stock [Line Items]            
Limited partners' capital account, units outstanding (in units)     88,950,136   88,950,136 21,475,068
Capital units, publicly owned (in units)     88,950,136   88,950,136 21,475,068