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v3.23.2

Investment in Securities - Additional Information (Detail) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 JPY (¥) Investment | Mar. 31, 2022 JPY (¥) Investment | Mar. 31, 2021 JPY (¥)
Schedule of Investments [Line Items] |  |  |
Net unrealized holding gains (losses) on trading securities | ¥ 18,065 | ¥ 26,075 | ¥ 83,643
Proceeds from sales of available-for-sale debt securities | 323,773 | 239,250 | 285,836
Available-for-sale debt securities gross realized gains | 7,757 | 6,493 | 8,854
Available-for-sale debt securities gross realized losses | 8,367 | 1,236 | 1,918
Investment funds fair value | ¥ 22,874 | ¥ 19,353 |
Number of investment securities in an unrealized loss position | Investment | 1,208 | 963 |
Debt securities available-for-sale accrued interest, after allowance for credit loss | ¥ 10,781 | ¥ 8,798 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] |  | Other Assets |
Finance revenues | 19,906 | ¥ 12,737 | 11,870
Accrued Interest Receivables [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt securities available-for-sale accrued interest, after allowance for credit loss | 0 |  |
Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | 16,032 | 11,709 |
Trading Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Net unrealized holding gains (losses) on trading debt securities | (469) | 213 | ¥ 120
Available-for-sale securities | Foreign Corporate Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | 6,605 | 7,644 |
Available-for-sale Debt Securities | Foreign Government Bond Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | ¥ 237 | ¥ 0 |

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- Definition Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 3A -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL120267853-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2A -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL121698322-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL120267856-210455 + Details
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