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Credit Quality of Financial Assets and the Allowance for Credit Losses - Additional Information (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
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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 | ¥ 152 | ¥ 79

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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 35 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-35 + Details
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