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Revenue (Tables)
 12 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenues
The nature, amount, timing and uncertainty of the Company’s revenue and cash flows and how they are affected by economic factors are most appropriately depicted through the Company’s revenue categories and
geographical markets. The following tables disaggregate the Company’s net revenue by revenue category and by geography:
For the Years Ended
September 30,
202520242023
(in millions)
Service revenue
$17,539 $16,114 $14,826 
Data processing revenue
19,993 17,714 16,007 
International transaction revenue
14,166 12,665 11,638 
Other revenue
4,053 3,197 2,479 
Client incentives(15,751)(13,764)(12,297)
Net revenue
$40,000 $35,926 $32,653 

For the Years Ended
September 30,
202520242023
(in millions)
U.S.$15,633 $14,780 $14,138 
International24,367 21,146 18,515 
Net revenue
$40,000 $35,926 $32,653