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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 | Sep. 30, 2023 | 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 | ¥ 149,069 | ¥ 2,588
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (13,479) | (207)
Available-for-sale debt Securities, 12 months or more Fair value | 628,120 | 662,897
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (249,297) | (164,330)
Available-for-sale debt Securities, Total Fair value | 777,189 | 665,485
Available-for-sale debt Securities, Total Gross unrealized losses | (262,776) | (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 | 149,069 | 2,588
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (13,479) | (207)
Available-for-sale debt Securities, 12 months or more Fair value | 628,120 | 662,897
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (249,297) | (164,330)
Available-for-sale debt Securities, Total Fair value | 777,189 | 665,485
Available-for-sale debt Securities, Total Gross unrealized losses | (262,776) | (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 | 107,381 | 97,721
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (3,827) | (1,508)
Available-for-sale debt Securities, 12 months or more Fair value | 231,641 | 194,280
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (31,642) | (19,542)
Available-for-sale debt Securities, Total Fair value | 339,022 | 292,001
Available-for-sale debt Securities, Total Gross unrealized losses | (35,469) | (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 | 106,003 | 97,721
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (3,743) | (1,508)
Available-for-sale debt Securities, 12 months or more Fair value | 227,748 | 190,805
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (31,480) | (19,398)
Available-for-sale debt Securities, Total Fair value | 333,751 | 288,526
Available-for-sale debt Securities, Total Gross unrealized losses | (35,223) | (20,906)
Corporate debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 158,052 | 191,669
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (3,540) | (6,570)
Available-for-sale debt Securities, 12 months or more Fair value | 475,625 | 401,994
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (95,429) | (66,837)
Available-for-sale debt Securities, Total Fair value | 633,677 | 593,663
Available-for-sale debt Securities, Total Gross unrealized losses | (98,969) | (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 | 158,052 | 191,669
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (3,540) | (6,570)
Available-for-sale debt Securities, 12 months or more Fair value | 475,625 | 401,994
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (95,429) | (66,837)
Available-for-sale debt Securities, Total Fair value | 633,677 | 593,663
Available-for-sale debt Securities, Total Gross unrealized losses | (98,969) | (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 | 7,409 | 16,691
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (34) | (672)
Available-for-sale debt Securities, 12 months or more Fair value | 35,761 | 23,653
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (2,278) | (1,509)
Available-for-sale debt Securities, Total Fair value | 43,170 | 40,344
Available-for-sale debt Securities, Total Gross unrealized losses | (2,312) | (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 | 7,409 | 16,691
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (34) | (672)
Available-for-sale debt Securities, 12 months or more Fair value | 35,761 | 23,653
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (2,278) | (1,509)
Available-for-sale debt Securities, Total Fair value | 43,170 | 40,344
Available-for-sale debt Securities, Total Gross unrealized losses | (2,312) | (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 | 2,856 | 63,958
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (231) | (2,300)
Available-for-sale debt Securities, 12 months or more Fair value | 145,796 | 88,503
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (7,107) | (6,851)
Available-for-sale debt Securities, Total Fair value | 148,652 | 152,461
Available-for-sale debt Securities, Total Gross unrealized losses | (7,338) | (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 | 2,856 | 63,958
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (231) | (2,300)
Available-for-sale debt Securities, 12 months or more Fair value | 145,267 | 88,503
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (6,939) | (6,851)
Available-for-sale debt Securities, Total Fair value | 148,123 | 152,461
Available-for-sale debt Securities, Total Gross unrealized losses | (7,170) | (9,151)
Available-for-sale debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 424,767 | 372,627
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (21,111) | (11,257)
Available-for-sale debt Securities, 12 months or more Fair value | 1,516,943 | 1,371,327
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (385,753) | (259,069)
Available-for-sale debt Securities, Total Fair value | 1,941,710 | 1,743,954
Available-for-sale debt Securities, Total Gross unrealized losses | (406,864) | (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 | 423,389 | 372,627
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (21,027) | (11,257)
Available-for-sale debt Securities, 12 months or more Fair value | 1,512,521 | 1,367,852
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (385,423) | (258,925)
Available-for-sale debt Securities, Total Fair value | 1,935,910 | 1,740,479
Available-for-sale debt Securities, Total Gross unrealized losses | ¥ (406,450) | ¥ (270,182)

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