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Revenue (Tables)
 6 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
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,
2024202320242023
(in millions)
Service revenue
$4,033 $3,771 $7,948 $7,282 
Data processing revenue
4,259 3,819 8,615 7,646 
International transaction revenue
2,984 2,749 6,003 5,546 
Other revenue
756 551 1,448 1,138 
Client incentives(3,257)(2,905)(6,605)(5,691)
Net revenue
$8,775 $7,985 $17,409 $15,921 

Three Months Ended
March 31,		Six Months Ended
March 31,
2024202320242023
(in millions)
U.S.$3,643 $3,540 $7,288 $7,107 
International5,132 4,445 10,121 8,814 
Net revenue
$8,775 $7,985 $17,409 $15,921