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Service Fees and Other Revenue and Other Expenses - Service Fees and Other Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Non Interest Income [Line Items]        
Total Service fees and other revenue $ 12,603 $ 11,949 $ 24,635 $ 23,247
Service fees and other revenue        
Non Interest Income [Line Items]        
Service fees 385 373 827 739
Foreign currency-related revenue 381 359 739 697
Delinquency fees 235 239 469 472
Travel commissions and fees 157 158 324 293
Other fees and revenues 122 103 213 249
Total Service fees and other revenue $ 1,280 $ 1,232 $ 2,572 $ 2,450