v3.26.1
Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Disaggregation of Revenue [Line Items]        
Net revenue $ 11,230 $ 9,594 $ 22,131 $ 19,104
U.S.        
Disaggregation of Revenue [Line Items]        
Net revenue 4,319 3,811 8,482 7,549
International        
Disaggregation of Revenue [Line Items]        
Net revenue 6,911 5,783 13,649 11,555
Service revenue        
Disaggregation of Revenue [Line Items]        
Net revenue 4,981 4,399 9,741 8,607
Data processing revenue        
Disaggregation of Revenue [Line Items]        
Net revenue 5,543 4,701 11,087 9,446
International transaction revenue        
Disaggregation of Revenue [Line Items]        
Net revenue 3,631 3,291 7,283 6,733
Other revenue        
Disaggregation of Revenue [Line Items]        
Net revenue 1,320 937 2,534 1,849
Client incentives        
Disaggregation of Revenue [Line Items]        
Net revenue $ (4,245) $ (3,734) $ (8,514) $ (7,531)