Consolidated Balance Sheet (Parenthetical) - shares	Sep. 30, 2016	Dec. 31, 2015
General partner—Phillips 66 units issued	1,978,603	1,683,425
General partner—Phillips 66 units outstanding	1,978,603	1,683,425
Common Units [Member] | Public [Member]
Units issued	43,134,902	24,138,750
Units outstanding	43,134,902	24,138,750
Common Units [Member] | Non-public [Member] | Phillips 66 [Member]
Units issued	60,162,787	58,349,042
Units outstanding	60,162,787	58,349,042