v3.10.0.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Jan. 31, 2019
Jun. 30, 2018
Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
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     $ 10,609,237,236
Class A Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,044,828,343  
Class B Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   51,596,090  
Class C Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   224,611,365