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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]    
Prepaid merchant bookings $ 396 $ 480
Deferred merchant bookings 8,394 7,151
Deferred revenue 167 163
Deferred Merchant Bookings    
Disaggregation of Revenue [Line Items]    
Deferred merchant bookings 7,500 6,200
Deferred merchant bookings recognized during period 5,200  
Revenue recognized during period 856  
Deferred Loyalty Rewards    
Disaggregation of Revenue [Line Items]    
Deferred merchant bookings 897 961
Revenue recognized during period 775  
Deferred Revenue    
Disaggregation of Revenue [Line Items]    
Revenue recognized during period 114  
Deferred revenue $ 167 $ 163