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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, 2022 | Mar. 31, 2021
Escrow Account [Roll Forward] |  |
Balance at beginning of period | $ 894 | $ 901
Deposits into the litigation escrow account | 250 | 0
Balance at end of period | 882 | 894
Interest Income | Opt-out Merchants |  |
Escrow Account [Roll Forward] |  |
Payments to opt-out merchants and interest earned on escrow funds | $ (262) | $ (7)

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- Definition Deposits To Litigation Escrow Account + References No definition available. + Details
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- Definition Payments for Legal Settlements and Interest Earned on Escrow Funds + References No definition available. + Details
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