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Significant Accounting Policies - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 21, 2023
shares
Segment Reporting Information [Line Items]        
Number of operating segments | segment 1      
Number of reportable segments | segment 1      
Cash in transit from payment processors $ 203 $ 86    
Restricted cash 136 75    
Accounts receivable, after allowance for credit loss, current 853 842    
Accounts receivable, allowance for credit loss, writeoff 23 0 $ 0  
Marketable securities, impairment loss 0 0 0  
Debt securities, available-for-sale, allowance for credit loss 0 0    
Goodwill and intangible asset impairment 0 0 0  
Advertising expense $ 388 426 $ 270  
Share-based compensation arrangement by share-based payment award, award requisite service period 4 years      
Unvested restricted non-voting common stock        
Segment Reporting Information [Line Items]        
Share-based compensation arrangement by share-based payment award, award requisite service period 3 years      
RSUs and Restricted Stock        
Segment Reporting Information [Line Items]        
Share-based compensation arrangement by share-based payment award, award requisite service period 4 years      
Minimum | Restricted stock units        
Segment Reporting Information [Line Items]        
Share-based compensation arrangement by share-based payment award, award requisite service period 2 years      
Maximum | Restricted stock units        
Segment Reporting Information [Line Items]        
Share-based compensation arrangement by share-based payment award, award requisite service period 4 years      
Common Stock        
Segment Reporting Information [Line Items]        
Convertible preferred stock, shares issued upon conversion (in shares) | shares       167,691,838
Transaction Receivable        
Segment Reporting Information [Line Items]        
Accounts receivable, after allowance for credit loss, current $ 357 $ 380