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Legal Matters - Additional Information (Details) $ in Millions | 6 Months Ended | 118 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Apr. 27, 2023 merchant
Loss Contingencies [Line Items] |  |  |
Deposits into the litigation escrow account | $ | $ 350 | $ 250 |
U.S. Covered Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Provision for legal matters | $ | 341 | $ 145 |
Deposits into the litigation escrow account | $ | $ 350 |  |
Interchange Multidistrict Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Settlement percentage | 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

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