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Commitments, Contingent Liabilities and Guarantees - Visa Funding and Bancorp Cash Payments (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 06, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2014 | Sep. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Sep. 30, 2025 | Dec. 31, 2008
Visa Funding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Visa Funding Amount |  | $ 375 | $ 1,500 | $ 150 | $ 500 | $ 350 | $ 600 | $ 250 | $ 300 | $ 600 | $ 450 | $ 150 | $ 1,565 | $ 400 | $ 800 | $ 500 | $ 500 | $ 3,000
Bancorp Cash Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bancorp Cash Payment Amount |  | $ 15 | $ 65 | $ 6 | $ 21 | $ 15 | $ 25 | $ 11 | $ 12 | $ 26 | $ 18 | $ 6 | $ 75 | $ 19 | $ 35 | $ 20 |  |
Bancorp Cash Payment | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bancorp Cash Payment Amount | $ 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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