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Service Fees and Other Revenue and Other Expenses - Other Expenses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Service Fees and Other Revenue and Other Expenses [Abstract]    
Data processing and equipment $ 705 $ 657
Professional services 541 455
Other 400 364
Total Other expenses $ 1,646 $ 1,476