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Legal Matters - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 109 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jul. 28, 2022 merchant
Loss Contingencies [Line Items] |  |  |  |
Deposits into the litigation escrow account | $ |  | $ 850 | $ 0 |
U.S. Covered Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Provision for legal matters | $ | $ 716 | 861 | $ 0 |
Deposits into the litigation escrow account | $ | $ 600 | $ 850 |  |
Interchange Multidistrict Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Settlement percentage | 55.00% | 55.00% |  |
Europe Merchant Litigation | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of plaintiffs |  |  |  | 850
Number of claims settled |  |  |  | 150
Number of claims pending |  |  |  | 650
Europe Merchant Litigation | Threatened Litigation | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of plaintiffs |  |  |  | 30

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