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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, 2025 | Mar. 31, 2024
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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 | ¥ 132,283 | ¥ 288,662
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (9,785) | (20,561)
Available-for-sale debt Securities, 12 months or more Fair value | 913,742 | 605,941
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (419,686) | (255,076)
Available-for-sale debt Securities, Total Fair value | 1,046,025 | 894,603
Available-for-sale debt Securities, Total Gross unrealized losses | (429,471) | (275,637)
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 | 132,283 | 288,662
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (9,785) | (20,561)
Available-for-sale debt Securities, 12 months or more Fair value | 913,742 | 605,941
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (419,686) | (255,076)
Available-for-sale debt Securities, Total Fair value | 1,046,025 | 894,603
Available-for-sale debt Securities, Total Gross unrealized losses | (429,471) | (275,637)
Japanese prefectural and foreign municipal bond securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 95,936 | 81,368
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (3,409) | (573)
Available-for-sale debt Securities, 12 months or more Fair value | 224,679 | 234,289
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (31,734) | (26,011)
Available-for-sale debt Securities, Total Fair value | 320,615 | 315,657
Available-for-sale debt Securities, Total Gross unrealized losses | (35,143) | (26,584)
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 | 94,691 | 80,058
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (3,325) | (488)
Available-for-sale debt Securities, 12 months or more Fair value | 220,950 | 230,512
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (31,573) | (25,848)
Available-for-sale debt Securities, Total Fair value | 315,641 | 310,570
Available-for-sale debt Securities, Total Gross unrealized losses | (34,898) | (26,336)
Corporate debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 152,094 | 113,066
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (5,196) | (1,317)
Available-for-sale debt Securities, 12 months or more Fair value | 427,837 | 418,666
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (113,802) | (81,225)
Available-for-sale debt Securities, Total Fair value | 579,931 | 531,732
Available-for-sale debt Securities, Total Gross unrealized losses | (118,998) | (82,542)
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 | 149,367 | 113,066
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (5,128) | (1,317)
Available-for-sale debt Securities, 12 months or more Fair value | 427,837 | 418,666
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (113,802) | (81,225)
Available-for-sale debt Securities, Total Fair value | 577,204 | 531,732
Available-for-sale debt Securities, Total Gross unrealized losses | (118,930) | (82,542)
CMBS and RMBS in the Americas |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 16,940 | 3,482
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (103) | (79)
Available-for-sale debt Securities, 12 months or more Fair value | 15,817 | 35,880
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (777) | (1,696)
Available-for-sale debt Securities, Total Fair value | 32,757 | 39,362
Available-for-sale debt Securities, Total Gross unrealized losses | (880) | (1,775)
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 | 16,940 | 3,482
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (103) | (79)
Available-for-sale debt Securities, 12 months or more Fair value | 15,817 | 35,880
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (777) | (1,696)
Available-for-sale debt Securities, Total Fair value | 32,757 | 39,362
Available-for-sale debt Securities, Total Gross unrealized losses | (880) | (1,775)
Other asset-backed securities and debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 56,671 | 46,950
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (411) | (2,557)
Available-for-sale debt Securities, 12 months or more Fair value | 35,183 | 52,382
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (6,966) | (3,356)
Available-for-sale debt Securities, Total Fair value | 91,854 | 99,332
Available-for-sale debt Securities, Total Gross unrealized losses | (7,377) | (5,913)
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 | 56,671 | 45,517
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (340) | (2,474)
Available-for-sale debt Securities, 12 months or more Fair value | 34,868 | 51,812
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (6,553) | (2,932)
Available-for-sale debt Securities, Total Fair value | 91,539 | 97,329
Available-for-sale debt Securities, Total Gross unrealized losses | (6,893) | (5,406)
Available-for-sale debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 453,924 | 533,528
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (18,904) | (25,087)
Available-for-sale debt Securities, 12 months or more Fair value | 1,617,258 | 1,347,158
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (572,965) | (367,364)
Available-for-sale debt Securities, Total Fair value | 2,071,182 | 1,880,686
Available-for-sale debt Securities, Total Gross unrealized losses | (591,869) | (392,451)
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 | 449,952 | 530,785
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (18,681) | (24,919)
Available-for-sale debt Securities, 12 months or more Fair value | 1,613,214 | 1,342,811
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (572,391) | (366,777)
Available-for-sale debt Securities, Total Fair value | 2,063,166 | 1,873,596
Available-for-sale debt Securities, Total Gross unrealized losses | ¥ (591,072) | ¥ (391,696)

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