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Legal Matters - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Loss Contingencies [Line Items] |  |
Deposits into the U.S. litigation escrow account | $ 625 | $ 375
Interchange Multidistrict Litigation |  |
Loss Contingencies [Line Items] |  |
Settlement percentage (in percent) | 94.00% |
U.S. Covered Litigation |  |
Loss Contingencies [Line Items] |  |
Provision for legal matters | $ 894 | $ 1,019

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