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v3.25.2

Investment in Securities (Amortized Cost Basis Amounts, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses and Fair Values of Available-for-Sale Securities and Held-to-Maturity Securities in Each Major Security Type) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | ¥ 3,174,036 | ¥ 3,015,940 |
Available-for-sale debt securities, Allowance for credit losses | (670) | (634) | ¥ (144)
Available-for-sale debt securities, Gross unrealized gains | 25,470 | 41,989 |
Available-for-sale debt securities, Gross unrealized losses | (591,199) | (391,817) |
Available-for-sale debt securities, Fair value | 2,607,637 | 2,665,478 |
Japanese and foreign government bond securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 1,520,672 | 1,299,025 |
Available-for-sale debt securities, Allowance for credit losses | 0 | 0 |
Available-for-sale debt securities, Gross unrealized gains | 1,325 | 11,526 |
Available-for-sale debt securities, Gross unrealized losses | (429,471) | (275,637) |
Available-for-sale debt securities, Fair value | 1,092,526 | 1,034,914 |
Japanese prefectural and foreign municipal bond securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 439,565 | 425,426 |
Available-for-sale debt securities, Allowance for credit losses | (245) | (248) |
Available-for-sale debt securities, Gross unrealized gains | 2,408 | 2,623 |
Available-for-sale debt securities, Gross unrealized losses | (34,898) | (26,336) |
Available-for-sale debt securities, Fair value | 406,830 | 401,465 |
Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 906,297 | 905,706 |
Available-for-sale debt securities, Allowance for credit losses | (34) | 0 |
Available-for-sale debt securities, Gross unrealized gains | 15,246 | 21,415 |
Available-for-sale debt securities, Gross unrealized losses | (118,964) | (82,542) |
Available-for-sale debt securities, Fair value | 802,545 | 844,579 |
CMBS and RMBS in the Americas |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 106,578 | 88,586 |
Available-for-sale debt securities, Allowance for credit losses | 0 | 0 |
Available-for-sale debt securities, Gross unrealized gains | 1,053 | 929 |
Available-for-sale debt securities, Gross unrealized losses | (880) | (1,775) |
Available-for-sale debt securities, Fair value | 106,751 | 87,740 |
Other asset-backed securities and debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 200,924 | 297,197 |
Available-for-sale debt securities, Allowance for credit losses | (391) | (386) |
Available-for-sale debt securities, Gross unrealized gains | 5,438 | 5,496 |
Available-for-sale debt securities, Gross unrealized losses | (6,986) | (5,527) |
Available-for-sale debt securities, Fair value | ¥ 198,985 | ¥ 296,780 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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