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Equity - Units Outstanding (Details) - shares
3 Months Ended 9 Months Ended
Sep. 15, 2017
Jun. 09, 2016
Mar. 29, 2016
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2016
Sep. 30, 2017
Dec. 31, 2016
Class of Stock [Line Items]                
Limited partners' capital account, units outstanding (in shares)       187,782,369     187,782,369  
Capital units, publicly owned (in shares)       191,614,662     191,614,662 180,936,167
Ownership interest percentage             46.40%  
Aggregate percentage of general partner interest             2.00%  
General Partner                
Class of Stock [Line Items]                
Capital units, publicly owned (in shares)       3,832,293     3,832,293 3,618,723
Aggregate percentage of general partner interest 2.00% 2.00% 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 shares)       98,832,233     98,832,233 88,367,308
Capital units, publicly owned (in shares)       98,832,233     98,832,233 88,367,308
Shell Pipeline Company L P | Common Units                
Class of Stock [Line Items]                
Limited partners' capital account, units outstanding (in shares)       88,950,136     88,950,136 21,475,068
Capital units, publicly owned (in shares)       88,950,136     88,950,136 21,475,068