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Equity - Units Outstanding (Details) - shares
3 Months Ended 9 Months Ended
Jun. 09, 2016
May 23, 2016
Mar. 29, 2016
May 18, 2015
Mar. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Class of Stock [Line Items]              
Limited partners' capital account, units outstanding (in units)           109,842,376  
Ownership interest (in percentage)           49.20%  
Capital units, publicly owned (in units)           180,936,167 154,941,269
Aggregate percentage of general partner interest           2.00%  
General Partner              
Class of Stock [Line Items]              
Capital units, publicly owned (in units)           3,618,723 3,098,825
Aggregate percentage of general partner interest     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)           88,367,308 62,892,308
Capital units, publicly owned (in units)           88,367,308 62,892,308
Aggregate percentage of general partner interest 2.00% 2.00%          
Shell Pipeline Company L P | Common Units              
Class of Stock [Line Items]              
Limited partners' capital account, units outstanding (in units)           21,475,068 21,475,068
Capital units, publicly owned (in units)           21,475,068 21,475,068
Shell Pipeline Company L P | Subordinated Units              
Class of Stock [Line Items]              
Limited partners' capital account, units outstanding (in units)           67,475,068 67,475,068