UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Mar. 31, 2016	Dec. 31, 2015
Limited partners' capital account, units outstanding (in units)	97,767,376
Shell Pipeline Company L P
General partners' capital account, units issued (in units)	3,372,295	3,098,825
General partners' capital account, units outstanding (in units)	3,372,295	3,098,825
Common unitholders | General Public
Limited partners' capital account, units issued (in units)	76,292,308	62,892,308
Limited partners' capital account, units outstanding (in units)	76,292,308	62,892,308
Common unitholders | 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