Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 03, 2016
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
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	Large Accelerated Filer
Common Units
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		109,842,376
Subordinated Units
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		67,475,068