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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 | 6 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Escrow Account [Roll Forward] |  |
Balance as of beginning of period | $ 2,990 | $ 3,089
Deposits into the U.S. litigation escrow account | 625 | 375
Balance as of end of period | 665 | 2,926
Interest Income | Opt-out Merchants |  |
Escrow Account [Roll Forward] |  |
Payments to opt-out merchants, net of interest earned on escrow funds | $ (2,950) | $ (538)

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