Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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Number of claims settled.

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Legal Matters - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended		121 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jul. 25, 2023 merchant	Jun. 08, 2023 claim
Loss Contingencies [Line Items]
Deposits into the U.S. litigation escrow account \| $		$ 850	$ 850
Number of class action claims \| claim					2
U.S. Covered Litigation
Loss Contingencies [Line Items]
Provision for legal matters \| $	$ 456	797	$ 861
Deposits into the U.S. litigation escrow account \| $	$ 500	$ 850
Interchange Multidistrict Litigation
Loss Contingencies [Line Items]
Settlement percentage	70.00%	70.00%
Europe Merchant Litigation \| Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs				1,100
Number of claims settled				175
Number of claims pending				900
Europe Merchant Litigation \| Threatened Litigation \| Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs				30