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U.S. and Europe Retrospective Responsibility Plans - Schedule of Changes in the U.S. Litigation Escrow Account (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Escrow Account [Roll Forward] |  |
Balance as of beginning of period | $ 1,764 | $ 1,449
Deposits into the U.S. litigation escrow account | 0 | 850
Balance as of end of period | 1,596 | 1,627
Interest Income | Opt-out Merchants |  |
Escrow Account [Roll Forward] |  |
Payments to opt-out merchants, net of interest earned on escrow funds | $ (168) | $ (672)

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