Document and Entity Information	3 Months Ended
	Mar. 31, 2015	May 13, 2015
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	SHLX
Entity Registrant Name	Shell Midstream Partners, L.P.
Entity Central Index Key	0001610466
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Common Units
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		67,475,068
Subordinated Units
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		67,475,068