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Legal Matters - Additional Information (Details) $ in Millions |  | 2 Months Ended | 9 Months Ended | 142 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 19, 2024 | Mar. 27, 2025 lawsuit | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Apr. 29, 2025 merchant | Dec. 13, 2024 lawsuit | Nov. 26, 2024 lawsuit
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Deposits into the U.S. litigation escrow account | $ |  |  | $ 375 | $ 0 |  |  |
Interchange Multidistrict Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Settlement percentage |  |  | 82.00% |  |  |  |
Europe Merchant Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  | 1,150 |  |
Number of claims settled |  |  |  |  | 950 |  |
Number of claims pending |  |  |  |  | 150 |  |
Merchant damages limitation, period prior to claim filing | 6 years |  |  |  |  |  |
Europe Merchant Litigation | Threatened Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  | 30 |  |
U.S. Debit Class Actions |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of class action lawsuits, seeking consolidation | lawsuit |  |  |  |  |  | 3 | 4
Number of lawsuits in which the court was transferred | lawsuit |  |  |  |  |  | 2 |
Number of class action lawsuits filed | lawsuit |  | 3 |  |  |  |  |
U.S. Covered Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Provision for legal matters | $ |  |  | $ 1,545 | $ 140 |  |  |

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