Equity - Schedule of Number of Units Outstanding (Details) - shares				6 Months Ended
	Jun. 09, 2016	May 23, 2016	Mar. 29, 2016	Jun. 30, 2017
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)				180,936,167
Expiration of subordination period (in units)				0
Units issued in connection with ATM program (in units)				96,863
Ending balance (in units)				181,033,030
General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)				3,618,723
Expiration of subordination period (in units)				0
Units issued in connection with ATM program (in units)	32,143		258,163	1,938
Ending balance (in units)				3,620,661
General Public | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)				88,367,308
Expiration of subordination period (in units)				0
Units issued in connection with ATM program (in units)		1,575,000	12,650,000	94,925
Ending balance (in units)				88,462,233
Shell Pipeline Company L P | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)				21,475,068
Expiration of subordination period (in units)				67,475,068
Units issued in connection with ATM program (in units)				0
Ending balance (in units)				88,950,136
Shell Pipeline Company L P | Subordinated Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)				67,475,068
Expiration of subordination period (in units)				(67,475,068)
Units issued in connection with ATM program (in units)				0
Ending balance (in units)				0