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Commitments, Guarantees, and Contingent Liabilities (Summary of Potential Future Payments, Book Value Recorded as Guarantee Liabilities of Guarantee Contracts Outstanding and Maturity of Longest Guarantee Contracts) (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Guarantor Obligations [Line Items] |  |
Potential future payment | ¥ 1,139,630 | ¥ 1,123,984
Book value of guarantee liabilities | 14,100 | 12,276
Transferred loans |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | 550,686 | 543,453
Book value of guarantee liabilities | ¥ 8,535 | ¥ 6,918
Maturity of the longest contract (Years) | 2062 | 2062
Real estate loans |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | ¥ 3,214 | ¥ 8,408
Book value of guarantee liabilities | ¥ 0 | ¥ 135
Maturity of the longest contract (Years) | 2026 | 2048
Other |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | ¥ 15,411 | ¥ 13,261
Book value of guarantee liabilities | ¥ 0 | ¥ 0
Maturity of the longest contract (Years) | 2043 | 2044
Corporate loans |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | ¥ 570,319 | ¥ 558,862
Book value of guarantee liabilities | ¥ 5,565 | ¥ 5,223
Maturity of the longest contract (Years) | 2032 | 2031

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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 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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