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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]      
Net revenues $ 32,653 $ 29,310 $ 24,105
U.S.      
Disaggregation of Revenue [Line Items]      
Net revenues 14,138 12,851 11,160
International      
Disaggregation of Revenue [Line Items]      
Net revenues 18,515 16,459 12,945
Service revenues      
Disaggregation of Revenue [Line Items]      
Net revenues 14,826 13,361 11,475
Data processing revenues      
Disaggregation of Revenue [Line Items]      
Net revenues 16,007 14,438 12,792
International transaction revenues      
Disaggregation of Revenue [Line Items]      
Net revenues 11,638 9,815 6,530
Other revenues      
Disaggregation of Revenue [Line Items]      
Net revenues 2,479 1,991 1,675
Client incentives      
Disaggregation of Revenue [Line Items]      
Net revenues $ (12,297) $ (10,295) $ (8,367)