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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]    
Net revenue $ 9,510 $ 8,634
U.S.    
Disaggregation of Revenue [Line Items]    
Net revenue 3,738 3,645
International    
Disaggregation of Revenue [Line Items]    
Net revenue 5,772 4,989
Service revenue    
Disaggregation of Revenue [Line Items]    
Net revenue 4,208 3,915
Data processing revenue    
Disaggregation of Revenue [Line Items]    
Net revenue 4,745 4,356
International transaction revenue    
Disaggregation of Revenue [Line Items]    
Net revenue 3,442 3,019
Other revenue    
Disaggregation of Revenue [Line Items]    
Net revenue 912 692
Client incentives    
Disaggregation of Revenue [Line Items]    
Net revenue $ (3,797) $ (3,348)