UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Sep. 30, 2016	Dec. 31, 2015
Limited partners' capital account, units outstanding (in units)	109,842,376
Shell Pipeline Company L P
General partners' capital account, units issued (in units)	3,618,723	3,098,825
General partners' capital account, units outstanding (in units)	3,618,723	3,098,825
Common Units | General Public
Limited partners' capital account, units issued (in units)	88,367,308	62,892,308
Limited partners' capital account, units outstanding (in units)	88,367,308	62,892,308
Common Units | Shell Pipeline Company L P
Limited partners' capital account, units issued (in units)	21,475,068	21,475,068
Limited partners' capital account, units outstanding (in units)	21,475,068	21,475,068
Subordinated Units | Shell Pipeline Company L P
Limited partners' capital account, units issued (in units)	67,475,068	67,475,068
Limited partners' capital account, units outstanding (in units)	67,475,068	67,475,068