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Revenues - Schedule of Net Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Net revenues $ 8,123 $ 7,275 $ 24,044 $ 21,523
U.S.        
Disaggregation of Revenue [Line Items]        
Net revenues 3,443 3,170 10,550 9,427
International        
Disaggregation of Revenue [Line Items]        
Net revenues 4,680 4,105 13,494 12,096
Service revenues        
Disaggregation of Revenue [Line Items]        
Net revenues 3,668 3,189 10,950 9,903
Data processing revenues        
Disaggregation of Revenue [Line Items]        
Net revenues 4,105 3,579 11,751 10,673
International transaction revenues        
Disaggregation of Revenue [Line Items]        
Net revenues 2,920 2,560 8,466 6,942
Other revenues        
Disaggregation of Revenue [Line Items]        
Net revenues 597 517 1,735 1,440
Client incentives        
Disaggregation of Revenue [Line Items]        
Net revenues $ (3,167) $ (2,570) $ (8,858) $ (7,435)