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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 | 9 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Escrow Account [Roll Forward] |  |
Balance as of beginning of period | $ 3,089 | $ 1,764
Deposits into the U.S. litigation escrow account | 375 | 0
Balance as of end of period | 2,696 | 1,596
Interest Income | Opt-out Merchants |  |
Escrow Account [Roll Forward] |  |
Payments to opt-out merchants, net of interest earned on escrow funds | $ (768) | $ (168)

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