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Investment in Securities (Information about Available-for-Sale and Held-to-Maturity Securities with Gross Unrealized Losses and Length of Time that Individual Securities Have Been in Continuous Unrealized Loss Position) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023
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Japanese and foreign government bond securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | ¥ 288,662 | ¥ 2,588
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (20,561) | (207)
Available-for-sale debt Securities, 12 months or more Fair value | 605,941 | 662,897
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (255,076) | (164,330)
Available-for-sale debt Securities, Total Fair value | 894,603 | 665,485
Available-for-sale debt Securities, Total Gross unrealized losses | (275,637) | (164,537)
Japanese and foreign government bond securities | Allowance for credit losses not recorded |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 288,662 | 2,588
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (20,561) | (207)
Available-for-sale debt Securities, 12 months or more Fair value | 605,941 | 662,897
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (255,076) | (164,330)
Available-for-sale debt Securities, Total Fair value | 894,603 | 665,485
Available-for-sale debt Securities, Total Gross unrealized losses | (275,637) | (164,537)
Japanese prefectural and foreign municipal bond securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 81,368 | 97,721
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (573) | (1,508)
Available-for-sale debt Securities, 12 months or more Fair value | 234,289 | 194,280
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (26,011) | (19,542)
Available-for-sale debt Securities, Total Fair value | 315,657 | 292,001
Available-for-sale debt Securities, Total Gross unrealized losses | (26,584) | (21,050)
Japanese prefectural and foreign municipal bond securities | Allowance for credit losses not recorded |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 80,058 | 97,721
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (488) | (1,508)
Available-for-sale debt Securities, 12 months or more Fair value | 230,512 | 190,805
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (25,848) | (19,398)
Available-for-sale debt Securities, Total Fair value | 310,570 | 288,526
Available-for-sale debt Securities, Total Gross unrealized losses | (26,336) | (20,906)
Corporate debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 113,066 | 191,669
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (1,317) | (6,570)
Available-for-sale debt Securities, 12 months or more Fair value | 418,666 | 401,994
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (81,225) | (66,837)
Available-for-sale debt Securities, Total Fair value | 531,732 | 593,663
Available-for-sale debt Securities, Total Gross unrealized losses | (82,542) | (73,407)
Corporate debt securities | Allowance for credit losses not recorded |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 113,066 | 191,669
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (1,317) | (6,570)
Available-for-sale debt Securities, 12 months or more Fair value | 418,666 | 401,994
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (81,225) | (66,837)
Available-for-sale debt Securities, Total Fair value | 531,732 | 593,663
Available-for-sale debt Securities, Total Gross unrealized losses | (82,542) | (73,407)
CMBS and RMBS in the Americas |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 3,482 | 16,691
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (79) | (672)
Available-for-sale debt Securities, 12 months or more Fair value | 35,880 | 23,653
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (1,696) | (1,509)
Available-for-sale debt Securities, Total Fair value | 39,362 | 40,344
Available-for-sale debt Securities, Total Gross unrealized losses | (1,775) | (2,181)
CMBS and RMBS in the Americas | Allowance for credit losses not recorded |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 3,482 | 16,691
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (79) | (672)
Available-for-sale debt Securities, 12 months or more Fair value | 35,880 | 23,653
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (1,696) | (1,509)
Available-for-sale debt Securities, Total Fair value | 39,362 | 40,344
Available-for-sale debt Securities, Total Gross unrealized losses | (1,775) | (2,181)
Other asset-backed securities and debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 46,950 | 63,958
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (2,557) | (2,300)
Available-for-sale debt Securities, 12 months or more Fair value | 52,382 | 88,503
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (3,356) | (6,851)
Available-for-sale debt Securities, Total Fair value | 99,332 | 152,461
Available-for-sale debt Securities, Total Gross unrealized losses | (5,913) | (9,151)
Other asset-backed securities and debt securities | Allowance for credit losses not recorded |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 45,517 | 63,958
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (2,474) | (2,300)
Available-for-sale debt Securities, 12 months or more Fair value | 51,812 | 88,503
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (2,932) | (6,851)
Available-for-sale debt Securities, Total Fair value | 97,329 | 152,461
Available-for-sale debt Securities, Total Gross unrealized losses | (5,406) | (9,151)
Available-for-sale debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 533,528 | 372,627
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (25,087) | (11,257)
Available-for-sale debt Securities, 12 months or more Fair value | 1,347,158 | 1,371,327
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (367,364) | (259,069)
Available-for-sale debt Securities, Total Fair value | 1,880,686 | 1,743,954
Available-for-sale debt Securities, Total Gross unrealized losses | (392,451) | (270,326)
Available-for-sale debt securities | Allowance for credit losses not recorded |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 530,785 | 372,627
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (24,919) | (11,257)
Available-for-sale debt Securities, 12 months or more Fair value | 1,342,811 | 1,367,852
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (366,777) | (258,925)
Available-for-sale debt Securities, Total Fair value | 1,873,596 | 1,740,479
Available-for-sale debt Securities, Total Gross unrealized losses | ¥ (391,696) | ¥ (270,182)

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