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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Net revenue	$ 35,926	$ 32,653	$ 29,310
U.S.
Disaggregation of Revenue [Line Items]
Net revenue	14,780	14,138	12,851
International
Disaggregation of Revenue [Line Items]
Net revenue	21,146	18,515	16,459
Service revenue
Disaggregation of Revenue [Line Items]
Net revenue	16,114	14,826	13,361
Data processing revenue
Disaggregation of Revenue [Line Items]
Net revenue	17,714	16,007	14,438
International transaction revenue
Disaggregation of Revenue [Line Items]
Net revenue	12,665	11,638	9,815
Other revenue
Disaggregation of Revenue [Line Items]
Net revenue	3,197	2,479	1,991
Client incentives
Disaggregation of Revenue [Line Items]
Net revenue	$ (13,764)	$ (12,297)	$ (10,295)

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