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Significant Concentrations of Credit Risk - Additional Information (Detail) - JPY (¥) ¥ in Billions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
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 | 9.20% | 9.30%
Consumer - Real Estate Loans | Assets | Customer [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk , percentage | 13.50% | 14.80%
Japan | Geographic Concentration Risk |  |
Concentration Risk [Line Items] |  |
Credit exposures on a geographic basis | ¥ 7,487 | ¥ 7,138
Japan | Geographic Concentration Risk | Assets | Customer [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk , percentage | 70.00% | 70.00%
United States | Geographic Concentration Risk |  |
Concentration Risk [Line Items] |  |
Credit exposures on a geographic basis | ¥ 1,429 | ¥ 1,355

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 + Details
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- Definition Description of risks that arise due to the nature or amount of financing received from a particular lender or reliance placed on that lender. At a minimum, the description informs financial statement users of the general nature of the risk. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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