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Summary of Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, shares in Millions
1 Months Ended 12 Months Ended
Jan. 01, 2021
Mar. 31, 2017
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Advertising partner arrangement cost     $ 324,300,000 $ 174,700,000 $ 120,300,000
Type of Cost, Good or Service [Extensible List]     us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember
Advertising cost     $ 29,500,000 $ 31,400,000 $ 11,300,000
Stock-based compensation expense     $ 770,182,000 $ 686,013,000 $ 538,211,000
Percentage of tax benefits likelihood of being realized     greater than 50%    
Highly liquid investments with original maturities     90 days or less    
Number of operating segment     1 1 1
Number of reporting unit     1 1 1
Goodwill impairment charges     $ 0 $ 0 $ 0
Accumulated deficit     (7,891,542,000) (6,945,930,000)  
Additional paid-in capital     10,200,141,000 9,205,256,000  
Convertible senior notes, net     1,675,169,000 $ 891,776,000  
Accounting Standards Update 2020-06 | Subsequent Event          
Summary Of Significant Accounting Policies [Line Items]          
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2021        
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          
Summary Of Significant Accounting Policies [Line Items]          
Accumulated deficit     (95,000,000.0)    
Additional paid-in capital     (664,000,000.0)    
Convertible senior notes, net     $ 569,000,000.0    
Accounting Standards Update 2020-01 | Subsequent Event          
Summary Of Significant Accounting Policies [Line Items]          
Change in accounting principle, accounting standards update, adopted [true false] true        
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2021        
Change in accounting principle, accounting standards update, transition option elected snap:AccountingStandardsUpdate202001ProspectiveMember        
Change in accounting principle, accounting standards update, immaterial effect [true false] true        
Accounting Standards Update 2019-12          
Summary Of Significant Accounting Policies [Line Items]          
Change in accounting principle, accounting standards update, early adoption [true false]       true  
Change in accounting principle, accounting standards update, immaterial effect [true false]       true  
Accounting Standards Update 2018-15          
Summary Of Significant Accounting Policies [Line Items]          
Change in accounting principle, accounting standards update, adopted [true false]     true    
Change in accounting principle, accounting standards update, adoption date     Jan. 01, 2020    
Change in accounting principle, accounting standards update, immaterial effect [true false]     true    
Accounting Standards Update 2016-13          
Summary Of Significant Accounting Policies [Line Items]          
Change in accounting principle, accounting standards update, adopted [true false]     true    
Change in accounting principle, accounting standards update, adoption date     Jan. 01, 2020    
Change in accounting principle, accounting standards update, immaterial effect [true false]     true    
Accounting Standards Update 2019-11          
Summary Of Significant Accounting Policies [Line Items]          
Change in accounting principle, accounting standards update, adopted [true false]     true    
Change in accounting principle, accounting standards update, adoption date     Jan. 01, 2020    
Change in accounting principle, accounting standards update, immaterial effect [true false]     true    
Computer Hardware and Software          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     3 years    
Furniture and Equipment          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     5 years    
Minimum | Buildings          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     25 years    
Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Business combination measurement period     1 year    
Maximum | Buildings          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     45 years    
Restricted Stock Units          
Summary Of Significant Accounting Policies [Line Items]          
Share based compensation arrangement by share based payment award vesting | shares       9.4  
Pre-2017 RSUs | First Year          
Summary Of Significant Accounting Policies [Line Items]          
Award vesting percentage     10.00%    
Pre-2017 RSUs | Second Year          
Summary Of Significant Accounting Policies [Line Items]          
Award vesting percentage     20.00%    
Pre-2017 RSUs | Third Year          
Summary Of Significant Accounting Policies [Line Items]          
Award vesting percentage     30.00%    
Pre-2017 RSUs | Fourth Year          
Summary Of Significant Accounting Policies [Line Items]          
Award vesting percentage     40.00%    
Post-2017 RSUs          
Summary Of Significant Accounting Policies [Line Items]          
Service condition satisfied, years     4 years    
Post-2017 RSUs | First Year          
Summary Of Significant Accounting Policies [Line Items]          
Award vesting percentage     10.00%    
Post-2017 RSUs | Second Year          
Summary Of Significant Accounting Policies [Line Items]          
Award vesting percentage     20.00%    
Post-2017 RSUs | Third Year          
Summary Of Significant Accounting Policies [Line Items]          
Award vesting percentage     30.00%    
Post-2017 RSUs | Fourth Year          
Summary Of Significant Accounting Policies [Line Items]          
Award vesting percentage     40.00%    
RSUs and RSAs Granted after February 2018 | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Service condition satisfied, years     3 years    
RSUs and RSAs Granted after February 2018 | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Service condition satisfied, years     4 years    
Class A Common Stock | IPO          
Summary Of Significant Accounting Policies [Line Items]          
Common stock, shares issued and sold | shares   160.3      
Initial public offering price per share | $ / shares   $ 17.00      
Class B Common Stock | Convertible Preferred Stock Other Than Series FP Preferred Stock | IPO          
Summary Of Significant Accounting Policies [Line Items]          
Conversion of convertible preferred stock into common stock | shares   246.8      
Class C Common Stock | IPO | CEO | Restricted Stock Units          
Summary Of Significant Accounting Policies [Line Items]          
Initial public offering price per share | $ / shares     $ 17.00    
Percentage of outstanding shares     3.00%    
Stock-based compensation expense     $ 636,600,000    
Share based compensation arrangement by share based payment award vesting | shares     37.4    
Vested awards, distribution period     3 years    
Vested awards, distribution description     The CEO award vested immediately on the closing of the IPO, and such shares were delivered to the CEO in quarterly installments over three years beginning in November 2017.    
Class C Common Stock | Series FP Preferred Stock | IPO          
Summary Of Significant Accounting Policies [Line Items]          
Conversion of convertible preferred stock into common stock | shares   215.9      
Class C Common Stock | Series FP Preferred Stock | IPO | CEO | Restricted Stock Units          
Summary Of Significant Accounting Policies [Line Items]          
Conversion of convertible preferred stock into common stock | shares     37.4