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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, 2023 | Mar. 31, 2022
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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 | ¥ 2,588 | ¥ 217,457
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (207) | (16,117)
Available-for-sale debt Securities, 12 months or more Fair value | 662,897 | 521,633
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (164,330) | (61,452)
Available-for-sale debt Securities, Total Fair value | 665,485 | 739,090
Available-for-sale debt Securities, Total Gross unrealized losses | (164,537) | (77,569)
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 | 2,588 | 217,457
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (207) | (16,117)
Available-for-sale debt Securities, 12 months or more Fair value | 662,897 | 521,633
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (164,330) | (61,452)
Available-for-sale debt Securities, Total Fair value | 665,485 | 739,090
Available-for-sale debt Securities, Total Gross unrealized losses | (164,537) | (77,569)
Japanese prefectural and foreign municipal bond securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 97,721 | 190,081
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (1,508) | (6,509)
Available-for-sale debt Securities, 12 months or more Fair value | 194,280 | 46,391
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (19,542) | (3,818)
Available-for-sale debt Securities, Total Fair value | 292,001 | 236,472
Available-for-sale debt Securities, Total Gross unrealized losses | (21,050) | (10,327)
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 | 97,721 | 190,081
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (1,508) | (6,509)
Available-for-sale debt Securities, 12 months or more Fair value | 190,805 | 43,338
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (19,398) | (3,686)
Available-for-sale debt Securities, Total Fair value | 288,526 | 233,419
Available-for-sale debt Securities, Total Gross unrealized losses | (20,906) | (10,195)
Corporate debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 191,669 | 373,506
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (6,570) | (19,340)
Available-for-sale debt Securities, 12 months or more Fair value | 401,994 | 156,687
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (66,837) | (14,292)
Available-for-sale debt Securities, Total Fair value | 593,663 | 530,193
Available-for-sale debt Securities, Total Gross unrealized losses | (73,407) | (33,632)
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 | 191,669 | 373,506
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (6,570) | (19,340)
Available-for-sale debt Securities, 12 months or more Fair value | 401,994 | 156,687
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (66,837) | (14,292)
Available-for-sale debt Securities, Total Fair value | 593,663 | 530,193
Available-for-sale debt Securities, Total Gross unrealized losses | (73,407) | (33,632)
CMBS and RMBS in the Americas |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 16,691 | 6,458
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (672) | (98)
Available-for-sale debt Securities, 12 months or more Fair value | 23,653 | 17,542
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (1,509) | (631)
Available-for-sale debt Securities, Total Fair value | 40,344 | 24,000
Available-for-sale debt Securities, Total Gross unrealized losses | (2,181) | (729)
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 | 16,691 | 6,458
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (672) | (98)
Available-for-sale debt Securities, 12 months or more Fair value | 23,653 | 17,542
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (1,509) | (631)
Available-for-sale debt Securities, Total Fair value | 40,344 | 24,000
Available-for-sale debt Securities, Total Gross unrealized losses | (2,181) | (729)
Other asset-backed securities and debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 63,958 | 66,543
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (2,300) | (995)
Available-for-sale debt Securities, 12 months or more Fair value | 88,503 | 37,432
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (6,851) | (1,524)
Available-for-sale debt Securities, Total Fair value | 152,461 | 103,975
Available-for-sale debt Securities, Total Gross unrealized losses | (9,151) | (2,519)
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 | 63,958 | 66,489
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (2,300) | (974)
Available-for-sale debt Securities, 12 months or more Fair value | 88,503 | 37,432
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (6,851) | (1,524)
Available-for-sale debt Securities, Total Fair value | 152,461 | 103,921
Available-for-sale debt Securities, Total Gross unrealized losses | (9,151) | (2,498)
Available-for-sale debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Available-for-sale debt Securities, Less than 12 months Fair value | 372,627 | 854,045
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (11,257) | (43,059)
Available-for-sale debt Securities, 12 months or more Fair value | 1,371,327 | 779,685
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (259,069) | (81,717)
Available-for-sale debt Securities, Total Fair value | 1,743,954 | 1,633,730
Available-for-sale debt Securities, Total Gross unrealized losses | (270,326) | (124,776)
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 | 372,627 | 853,991
Available-for-sale debt Securities, Less than 12 months Gross unrealized losses | (11,257) | (43,038)
Available-for-sale debt Securities, 12 months or more Fair value | 1,367,852 | 776,632
Available-for-sale debt Securities, 12 months or more Gross unrealized losses | (258,925) | (81,585)
Available-for-sale debt Securities, Total Fair value | 1,740,479 | 1,630,623
Available-for-sale debt Securities, Total Gross unrealized losses | ¥ (270,182) | ¥ (124,623)

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