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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]    
Prepaid merchant bookings $ 522 $ 591
Deferred merchant bookings 7,457 5,688
Deferred revenue 160 166
Deferred Merchant Bookings    
Disaggregation of Revenue [Line Items]    
Deferred merchant bookings 6,500 4,900
Deferred merchant bookings recognized during period 4,200  
Revenue recognized during period 686  
Deferred Loyalty Rewards    
Disaggregation of Revenue [Line Items]    
Deferred merchant bookings 915 798
Revenue recognized during period 575  
Deferred Revenue    
Disaggregation of Revenue [Line Items]    
Revenue recognized during period 109  
Deferred revenue $ 160 $ 166