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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 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | ¥ 2,488,858 | ¥ 2,276,425 |
Available-for-sale debt securities, Allowance for credit losses | (144) | (153) | ¥ (120)
Available-for-sale debt securities, Gross unrealized gains | 16,076 | 23,242 |
Available-for-sale debt securities, Gross unrealized losses | (270,182) | (124,623) |
Available-for-sale debt securities, Fair value | 2,234,608 | 2,174,891 |
Held-to-maturity securities, Amortized cost | 114,759 | 114,312 |
Held-to-maturity securities, Fair value | 129,678 |  |
Total amortized cost | 2,603,617 | 2,390,737 |
Total allowance for credit losses | (144) | (153) |
Total gross unrealized gains | 30,995 | 44,371 |
Total gross unrealized losses | (270,182) | (124,623) |
Total fair values | 2,364,286 | 2,310,332 |
Japanese and foreign government bond securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 962,969 | 905,004 |
Available-for-sale debt securities, Allowance for credit losses | 0 | 0 |
Available-for-sale debt securities, Gross unrealized gains | 2,863 | 5,178 |
Available-for-sale debt securities, Gross unrealized losses | (164,537) | (77,569) |
Available-for-sale debt securities, Fair value | 801,295 | 832,613 |
Japanese prefectural and foreign municipal bond securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 389,150 | 333,449 |
Available-for-sale debt securities, Allowance for credit losses | (144) | (132) |
Available-for-sale debt securities, Gross unrealized gains | 1,146 | 2,482 |
Available-for-sale debt securities, Gross unrealized losses | (20,906) | (10,195) |
Available-for-sale debt securities, Fair value | 369,246 | 325,604 |
Corporate debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 851,525 | 873,178 |
Available-for-sale debt securities, Allowance for credit losses | 0 | 0 |
Available-for-sale debt securities, Gross unrealized gains | 6,270 | 10,014 |
Available-for-sale debt securities, Gross unrealized losses | (73,407) | (33,632) |
Available-for-sale debt securities, Fair value | 784,388 | 849,560 |
CMBS and RMBS in the Americas |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 45,292 | 29,349 |
Available-for-sale debt securities, Allowance for credit losses | 0 | 0 |
Available-for-sale debt securities, Gross unrealized gains | 62 | 112 |
Available-for-sale debt securities, Gross unrealized losses | (2,181) | (729) |
Available-for-sale debt securities, Fair value | 43,173 | 28,732 |
Other asset-backed securities and debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, Amortized cost | 239,922 | 135,445 |
Available-for-sale debt securities, Allowance for credit losses | 0 | (21) |
Available-for-sale debt securities, Gross unrealized gains | 5,735 | 5,456 |
Available-for-sale debt securities, Gross unrealized losses | (9,151) | (2,498) |
Available-for-sale debt securities, Fair value | 236,506 | 138,382 |
Japanese government bond securities and other |  |  |
Schedule of Investments [Line Items] |  |  |
Held-to-maturity securities, Amortized cost | 114,759 | 114,312 |
Held-to-maturity securities, Allowance for credit losses | 0 | 0 |
Held-to-maturity securities, Gross unrealized gains | 14,919 | 21,129 |
Held-to-maturity securities, Gross unrealized losses | 0 | 0 |
Held-to-maturity securities, Fair value | ¥ 129,678 | ¥ 135,441 |

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