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U.S. and Europe Retrospective Responsibility Plans - Schedule of Changes in the U.S. Litigation Escrow Account (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Escrow Account [Roll Forward] |  |  |
Balance as of beginning of period | $ 3,089 | $ 1,764 |
Deposits into the U.S. litigation escrow account | 875 | 1,500 | $ 1,000
Balance as of end of period | 2,990 | 3,089 | $ 1,764
Interest Income | Opt-out Merchants |  |  |
Escrow Account [Roll Forward] |  |  |
Payments to opt-out merchants, net of interest earned on escrow funds | $ (974) | $ (175) |

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