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Revenue (Tables)
 6 Months Ended
Mar. 31, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue The following tables disaggregate the Company’s net revenue by revenue category and by geography:
Three Months Ended
March 31,		Six Months Ended
March 31,
2025202420252024
(in millions)
Service revenue
$4,399 $4,033 $8,607 $7,948 
Data processing revenue
4,701 4,259 9,446 8,615 
International transaction revenue
3,291 2,984 6,733 6,003 
Other revenue
937 756 1,849 1,448 
Client incentives(3,734)(3,257)(7,531)(6,605)
Net revenue
$9,594 $8,775 $19,104 $17,409 

Three Months Ended
March 31,		Six Months Ended
March 31,
2025202420252024
(in millions)
U.S.$3,811 $3,643 $7,549 $7,288 
International5,783 5,132 11,555 10,121 
Net revenue
$9,594 $8,775 $19,104 $17,409