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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Net revenue	$ 10,901	$ 9,510
U.S.
Disaggregation of Revenue [Line Items]
Net revenue	4,163	3,738
International
Disaggregation of Revenue [Line Items]
Net revenue	6,738	5,772
Service revenue
Disaggregation of Revenue [Line Items]
Net revenue	4,760	4,208
Data processing revenue
Disaggregation of Revenue [Line Items]
Net revenue	5,544	4,745
International transaction revenue
Disaggregation of Revenue [Line Items]
Net revenue	3,652	3,442
Other revenue
Disaggregation of Revenue [Line Items]
Net revenue	1,214	912
Client incentives
Disaggregation of Revenue [Line Items]
Net revenue	$ (4,269)	$ (3,797)

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