v3.26.1
Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disaggregation of Revenue [Line Items]    
Prepaid merchant bookings $ 488 $ 313
Deferred merchant bookings 15,426 10,428
Deferred revenue 175 163
Deferred Merchant Bookings    
Disaggregation of Revenue [Line Items]    
Deferred merchant bookings 14,400 9,300
Deferred merchant bookings recognized during period 6,600  
Revenue recognized during period 891  
Deferred Loyalty Rewards    
Disaggregation of Revenue [Line Items]    
Deferred merchant bookings 1,100 1,100
Revenue recognized during period 561  
Deferred Revenue    
Disaggregation of Revenue [Line Items]    
Revenue recognized during period 95  
Deferred revenue $ 175 $ 163