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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares
Mar. 31, 2017
Dec. 31, 2016
Limited partners' capital account, units outstanding (in units) 177,317,444  
Shell Pipeline Company L P    
General partners' capital account, units issued (in units) 3,618,723 3,618,723
General partners' capital account, units outstanding (in units) 3,618,723 3,618,723
Common Units | General Public    
Limited partners' capital account, units issued (in units) 88,367,308 88,367,308
Limited partners' capital account, units outstanding (in units) 88,367,308 88,367,308
Common Units | Shell Pipeline Company L P    
Limited partners' capital account, units issued (in units) 88,950,136 21,475,068
Limited partners' capital account, units outstanding (in units) 88,950,136 21,475,068
Subordinated Units | Shell Pipeline Company L P    
Limited partners' capital account, units issued (in units) 0 67,475,068
Limited partners' capital account, units outstanding (in units) 0 67,475,068