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Convertible Notes - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended
Apr. 30, 2020
Aug. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Jan. 01, 2021
Dec. 31, 2020
Debt Instrument [Line Items]            
Accumulated deficit     $ (8,083,393,000)     $ (7,891,542,000)
Additional paid-in capital     9,777,646,000     10,200,141,000
Convertible senior notes, net     2,245,203,000     $ 1,675,169,000
Amortization of debt discount and issuance costs     $ 1,044,000 $ 11,563,000    
Accounting Standards Update 2020-06            
Debt Instrument [Line Items]            
Change in accounting principle, accounting standards update, adoption date     Jan. 01, 2021      
Change in accounting principle, accounting standards update, adopted [true false]     true      
Change in accounting principle, accounting standards update, early adoption [true false]     true      
Change in accounting principle, accounting standards update, transition option elected     snap:AccountingStandardsUpdate202006RetrospectiveMember      
Accounting Standards Update 2020-06 | Revision of Prior Period, Accounting Standards Update, Adjustment            
Debt Instrument [Line Items]            
Accumulated deficit         $ (95,000,000.0)  
Additional paid-in capital         (664,000,000.0)  
Convertible senior notes, net         $ 569,000,000.0  
2025 Notes            
Debt Instrument [Line Items]            
Debt instrument, principal amount $ 1,000,000,000.0   $ 1,000,000,000      
Indenture date Apr. 28, 2020          
Proceeds from issuance of convertible notes, net of issuance costs $ 888,600,000          
Interest payment beginning date Nov. 01, 2020          
Debt instrument, interest rate 0.25%          
Debt instrument, interest rate terms     Interest is payable in cash semi-annually in arrears beginning on November 1, 2020 at a rate of 0.25% per year.      
Debt instrument, maturity date May 01, 2025          
Debt instrument convertible, amortization period     4 years 1 month 6 days      
If-converted value exceeding principal amount     $ 1,400,000,000      
Cap price, net cost     $ 100,000,000.0      
2025 Notes | Class A Non-voting Common Stock            
Debt Instrument [Line Items]            
Shares issued upon conversion of each $1000 principal amount 46.1233          
Debt instrument, convertible principal amount used in conversion rate $ 1,000          
Conversion price per share $ 21.68          
Cap price, per share     $ 32.12      
2026 Notes            
Debt Instrument [Line Items]            
Debt instrument, principal amount   $ 1,265,000,000 $ 1,265,000,000      
Proceeds from issuance of convertible notes, net of issuance costs   $ 1,150,000,000        
Interest payment beginning date   Feb. 01, 2020        
Debt instrument, interest rate   0.75%        
Debt instrument, interest rate terms     Interest is payable in cash semi-annually in arrears beginning on February 1, 2020 at a rate of 0.75% per year.      
Debt instrument, maturity date   Aug. 01, 2026        
Debt instrument convertible, amortization period     5 years 3 months 18 days      
Amortization of debt discount and issuance costs       11,600,000    
Amortization of debt issuance costs     $ 1,000,000.0      
Contractual interest expense     3,000,000.0 $ 2,400,000    
If-converted value exceeding principal amount     1,600,000,000      
Cap price, net cost     $ 102,100,000      
2026 Notes | Class A Non-voting Common Stock            
Debt Instrument [Line Items]            
Shares issued upon conversion of each $1000 principal amount   43.8481        
Debt instrument, convertible principal amount used in conversion rate   $ 1,000        
Conversion price per share   $ 22.81        
Cap price, per share     $ 32.58      
Initial Placement | 2025 Notes            
Debt Instrument [Line Items]            
Debt instrument, principal amount $ 850,000,000.0          
Over-Allotment Option | 2025 Notes            
Debt Instrument [Line Items]            
Debt instrument, principal amount $ 150,000,000.0