v3.19.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2019
Oct. 17, 2019
Entity Information [Line Items]    
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 SNAP  
Entity Central Index Key 0001564408  
Entity Registrant Name SNAP INC  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Title of 12(b) Security Class A Common Stock, par value $0.00001 per share  
Security Exchange Name NYSE  
Entity File Number 001-38017  
Entity Tax Identification Number 45-5452795  
Entity Address, Address Line One 2772 Donald Douglas Loop North  
Entity Address, City or Town Santa Monica  
Entity Address, State or Province CA  
Entity Incorporation, State or Country Code DE  
Entity Address, Postal Zip Code 90405  
City Area Code (310)  
Local Phone Number 399-3339  
Document Quarterly Report true  
Document Transition Report false  
Class A Common Stock    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   1,138,349,322
Class B Common Stock    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   32,056,088
Class C Common Stock    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   229,564,537