v3.19.3.a.u2
Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 28, 2019
Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol SNAP    
Entity Registrant Name SNAP INC    
Entity Central Index Key 0001564408    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 13.6
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-38017    
Entity Incorporation, State or Country Code DE    
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 Address, Postal Zip Code 90405    
City Area Code (310)    
Local Phone Number 399-3339    
Title of 12(b) Security Class A Common Stock, par value $0.00001 per share    
Security Exchange Name NYSE    
Entity Interactive Data Current Yes    
Class A Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,164,739,858  
Class B Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   24,303,857  
Class C Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   231,147,476