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v3.23.3

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 | Sep. 30, 2023 | Mar. 31, 2023
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Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | ¥ 2,709,258 | ¥ 2,488,858
Available-for-sale debt securities, Allowance for credit losses | (468) | (144)
Available-for-sale debt securities, Gross unrealized gains | 15,977 | 16,076
Available-for-sale debt securities, Gross unrealized losses | (406,450) | (270,182)
Available-for-sale debt securities, Fair value | 2,318,317 | 2,234,608
Held-to-maturity securities, Amortized cost | 115,515 | 114,759
Total amortized cost | 2,824,773 | 2,603,617
Total allowance for credit losses | (468) | (144)
Total gross unrealized gains | 26,075 | 30,995
Total gross unrealized losses | (407,943) | (270,182)
Total fair values | 2,442,437 | 2,364,286
Japanese and foreign government bond securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 1,073,621 | 962,969
Available-for-sale debt securities, Allowance for credit losses | 0 | 0
Available-for-sale debt securities, Gross unrealized gains | 962 | 2,863
Available-for-sale debt securities, Gross unrealized losses | (262,776) | (164,537)
Available-for-sale debt securities, Fair value | 811,807 | 801,295
Japanese prefectural and foreign municipal bond securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 404,890 | 389,150
Available-for-sale debt securities, Allowance for credit losses | (246) | (144)
Available-for-sale debt securities, Gross unrealized gains | 390 | 1,146
Available-for-sale debt securities, Gross unrealized losses | (35,223) | (20,906)
Available-for-sale debt securities, Fair value | 369,811 | 369,246
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 892,807 | 851,525
Available-for-sale debt securities, Allowance for credit losses | 0 | 0
Available-for-sale debt securities, Gross unrealized gains | 8,971 | 6,270
Available-for-sale debt securities, Gross unrealized losses | (98,969) | (73,407)
Available-for-sale debt securities, Fair value | 802,809 | 784,388
CMBS and RMBS in the Americas |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 70,307 | 45,292
Available-for-sale debt securities, Allowance for credit losses | 0 | 0
Available-for-sale debt securities, Gross unrealized gains | 198 | 62
Available-for-sale debt securities, Gross unrealized losses | (2,312) | (2,181)
Available-for-sale debt securities, Fair value | 68,193 | 43,173
Other asset-backed securities and debt securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized cost | 267,633 | 239,922
Available-for-sale debt securities, Allowance for credit losses | (222) | 0
Available-for-sale debt securities, Gross unrealized gains | 5,456 | 5,735
Available-for-sale debt securities, Gross unrealized losses | (7,170) | (9,151)
Available-for-sale debt securities, Fair value | 265,697 | 236,506
Japanese government bond securities and other |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities, Amortized cost | 115,515 | 114,759
Held-to-maturity securities, Allowance for credit losses | 0 | 0
Held-to-maturity securities, Gross unrealized gains | 10,098 | 14,919
Held-to-maturity securities, Gross unrealized losses | (1,493) | 0
Held-to-maturity securities, Fair value | ¥ 124,120 | ¥ 129,678

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