v3.19.3
Cover Page - shares
9 Months Ended
Sep. 30, 2019
Nov. 01, 2019
Cover page.    
Document Quarterly Report true  
Document Transition Report false  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol SHLX  
Entity Registrant Name Shell Midstream Partners, L.P.  
Entity Shell Company false  
Security Exchange Name NYSE  
Title of 12(b) Security Common Units, Representing Limited Partner Interests  
Entity Incorporation, State or Country Code DE  
Entity Central Index Key 0001610466  
Current Fiscal Year End Date --12-31  
Entity Emerging Growth Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity File Number 001-36710  
Entity Tax Identification Number 46-5223743  
City Area Code 832  
Local Phone Number 337-2034  
Entity Address, Postal Zip Code 77079  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Address Line One 150 N. Dairy Ashford  
Entity Common Stock, Shares Outstanding   233,289,537