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Credit Quality of Financial Assets and the Allowance for Credit Losses - Additional Information (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2023	Mar. 31, 2023
Loans for which real estate is received as collateral | Instalment loans
Financing Receivable, Modifications [Line Items]
Mortgage loans in process of foreclosure	¥ 59	¥ 57

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Balance Type:	na
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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 35
-SubTopic 10
-Topic 310
-Publisher FASB
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Balance Type:	debit
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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: