Equity - Schedule of Number of Units Outstanding (Details)	3 Months Ended
	Mar. 31, 2017 shares
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)	180,936,167
Expiration of subordination period (in units)	0
Ending balance (in units)	180,936,167
General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)	3,618,723
Expiration of subordination period (in units)	0
Ending balance (in units)	3,618,723
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
Ending balance (in units)	88,367,308
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
Ending balance (in units)	88,950,136
Shell Pipeline Company L P | Subordinate Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)	67,475,068
Expiration of subordination period (in units)	(67,475,068)
Ending balance (in units)	0