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v3.25.3

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 | Sep. 30, 2025 | Mar. 31, 2025
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Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | ¥ 3,394,683 | ¥ 3,174,036
Available-for-sale debt securities, Allowance for credit losses | (771) | (670)
Available-for-sale debt securities, Gross unrealized gains | 37,382 | 25,470
Available-for-sale debt securities, Gross unrealized losses | (728,240) | (591,199)
Available-for-sale debt securities, Fair value | 2,703,054 | 2,607,637
Japanese and foreign government bond securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 1,607,338 | 1,520,672
Available-for-sale debt securities, Allowance for credit losses | 0 | 0
Available-for-sale debt securities, Gross unrealized gains | 153 | 1,325
Available-for-sale debt securities, Gross unrealized losses | (549,209) | (429,471)
Available-for-sale debt securities, Fair value | 1,058,282 | 1,092,526
Japanese prefectural and foreign municipal bond securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 440,413 | 439,565
Available-for-sale debt securities, Allowance for credit losses | (244) | (245)
Available-for-sale debt securities, Gross unrealized gains | 4,320 | 2,408
Available-for-sale debt securities, Gross unrealized losses | (34,524) | (34,898)
Available-for-sale debt securities, Fair value | 409,965 | 406,830
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 1,051,245 | 906,297
Available-for-sale debt securities, Allowance for credit losses | (8) | (34)
Available-for-sale debt securities, Gross unrealized gains | 25,781 | 15,246
Available-for-sale debt securities, Gross unrealized losses | (135,899) | (118,964)
Available-for-sale debt securities, Fair value | 941,119 | 802,545
CMBS and RMBS in the Americas |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 131,783 | 106,578
Available-for-sale debt securities, Allowance for credit losses | 0 | 0
Available-for-sale debt securities, Gross unrealized gains | 1,505 | 1,053
Available-for-sale debt securities, Gross unrealized losses | (992) | (880)
Available-for-sale debt securities, Fair value | 132,296 | 106,751
Other asset-backed securities and debt securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 163,904 | 200,924
Available-for-sale debt securities, Allowance for credit losses | (519) | (391)
Available-for-sale debt securities, Gross unrealized gains | 5,623 | 5,438
Available-for-sale debt securities, Gross unrealized losses | (7,616) | (6,986)
Available-for-sale debt securities, Fair value | ¥ 161,392 | ¥ 198,985

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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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