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Credit Quality of Financial Assets and the Allowance for Credit Losses - Additional Information (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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Loans for which real estate is received as collateral | Instalment loans |  |
Financing Receivable, Modifications [Line Items] |  |
Mortgage loans in process of foreclosure | ¥ 79 | ¥ 119

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