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Significant Concentrations of Credit Risk - Additional Information (Detail) - JPY (¥) ¥ in Billions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Concentration Risk [Line Items] |  |
Concentration of risk description | no concentration with a single obligor exceeded 1% of the Company’s consolidated total assets | no concentration with a single obligor exceeded 1% of the Company’s consolidated total assets
Transportation equipment | Assets | Customer [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk , percentage | 10.90% | 9.20%
Consumer - Real Estate Loans | Assets | Customer [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk , percentage | 11.90% | 13.50%
Japan | Geographic Concentration Risk |  |
Concentration Risk [Line Items] |  |
Credit exposures on a geographic basis | ¥ 7,855 | ¥ 7,487
Japan | Geographic Concentration Risk | Assets | Customer [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk , percentage | 69.00% | 70.00%
United States | Geographic Concentration Risk |  |
Concentration Risk [Line Items] |  |
Credit exposures on a geographic basis | ¥ 1,507 | ¥ 1,429

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 + Details
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