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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Financial Effect of Modifications of Financing Receivable (Detail) - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
Interest rate reduction | Consumer borrowers | Real estate loans |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction, Minimum limit |  | 3.90%
Interest rate reduction, Maximum limit |  | 0.00%
Interest rate reduction | Consumer borrowers | Card loans |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction, Minimum limit | 12.70% | 12.60%
Interest rate reduction, Maximum limit | 0.40% | 0.40%
Interest rate reduction | Consumer borrowers | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Interest rate reduction, Minimum limit | 12.40% | 14.20%
Interest rate reduction, Maximum limit | 1.80% | 2.50%
Term extension | Consumer borrowers | Real estate loans |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 1 year | 1 year
Term extension | Consumer borrowers | Card loans |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 6 years 7 months 6 days | 6 years 7 months 6 days
Term extension | Consumer borrowers | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 4 years 10 months 24 days | 4 years 9 months 18 days
Term extension | Corporate borrowers | Real estate companies in Japan | Japan |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension |  | 6 months
Term extension | Corporate borrowers | Commercial, industrial and other companies in Japan | Japan |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 6 months | 7 months 6 days
Term extension | Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension | 4 years 8 months 12 days | 4 years 8 months 12 days
Principal forgiveness | Consumer borrowers | Real estate loans |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness | ¥ 0 | ¥ 1
Principal forgiveness | Consumer borrowers | Card loans |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness | 40 | 92
Principal forgiveness | Consumer borrowers | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness | 177 | 336
Principal forgiveness | Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness | 3 | 108
Principal forgiveness | Net investment in leases | Overseas |  |
Financing Receivable, Modifications [Line Items] |  |
Principal forgiveness | ¥ 0 | ¥ 0

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- 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 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-34 + Details
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