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U.S. and Europe Retrospective Responsibility Plans - Changes in the U.S. Litigation Escrow Account (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Escrow Account [Roll Forward] |  |
Balance as of beginning of period | $ 1,764 | $ 1,449
Deposits into the U.S. litigation escrow account | 0 | 350
Balance as of end of period | 1,584 | 1,616
Interest Income | Opt-out Merchants |  |
Escrow Account [Roll Forward] |  |
Payments to opt-out merchants, net of interest earned on escrow funds | $ (180) | $ (183)

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