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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 | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Guarantor Obligations [Line Items] |  |
Potential future payment | ¥ 1,151,414 | ¥ 1,231,425
Book value of guarantee liabilities | 8,424 | 57,456
Transferred loans |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | 519,665 | 436,069
Book value of guarantee liabilities | ¥ 3,405 | ¥ 2,185
Maturity of the longest contract (Years) | 2062 | 2062
Consumer loans |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | ¥ 0 | ¥ 295,273
Book value of guarantee liabilities | 0 | ¥ 48,207
Maturity of the longest contract (Years) |  | 2034
Real estate loans |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | 9,856 | ¥ 18,193
Book value of guarantee liabilities | ¥ 180 | ¥ 2,031
Maturity of the longest contract (Years) | 2048 | 2048
Other |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | ¥ 13,350 | ¥ 2,484
Book value of guarantee liabilities | ¥ 0 | ¥ 0
Maturity of the longest contract (Years) | 2044 | 2036
Corporate loans |  |
Guarantor Obligations [Line Items] |  |
Potential future payment | ¥ 608,543 | ¥ 479,406
Book value of guarantee liabilities | ¥ 4,839 | ¥ 5,033
Maturity of the longest contract (Years) | 2048 | 2029

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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 (b)(1) -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 (c) -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 (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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