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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]      
Net revenues $ 29,310 $ 24,105 $ 21,846
U.S.      
Disaggregation of Revenue [Line Items]      
Net revenues 12,851 11,160 10,125
International      
Disaggregation of Revenue [Line Items]      
Net revenues 16,459 12,945 11,721
Service revenues      
Disaggregation of Revenue [Line Items]      
Net revenues 13,361 11,475 9,804
Data processing revenues      
Disaggregation of Revenue [Line Items]      
Net revenues 14,438 12,792 10,975
International transaction revenues      
Disaggregation of Revenue [Line Items]      
Net revenues 9,815 6,530 6,299
Other revenues      
Disaggregation of Revenue [Line Items]      
Net revenues 1,991 1,675 1,432
Client incentives      
Disaggregation of Revenue [Line Items]      
Net revenues $ (10,295) $ (8,367) $ (6,664)