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Legal Matters - Additional Information (Details) $ in Millions	6 Months Ended		105 Months Ended
	Mar. 31, 2022 USD ($) merchant	Mar. 31, 2021 USD ($)	Mar. 31, 2022 merchant
Loss Contingencies [Line Items]
Deposits into the litigation escrow account | $	$ 250	$ 0
U.S. Covered Litigation
Loss Contingencies [Line Items]
Provision for legal matters | $	145	0
Deposits into the litigation escrow account | $	250
Payments for legal matters | $	$ 262	$ 7
Interchange Multidistrict Litigation
Loss Contingencies [Line Items]
Settlement percentage	50.00%		50.00%
U.K. Merchant Litigation
Loss Contingencies [Line Items]
Number of plaintiffs | merchant			850
Number of claims settled | merchant			150
Merchants with outstanding claims | merchant	650		650
U.K. Merchant Litigation | Threatened Litigation
Loss Contingencies [Line Items]
Number of plaintiffs | merchant			30

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Amount of cash outflow reducing loss contingency liability.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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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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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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Number of pending claims pertaining to a loss contingency.

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Deposits To Litigation Escrow Account

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Litigation, Settlement Percentage

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