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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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