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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Schedule of Investments [Line Items]      
Available-for-sale debt securities, Amortized cost ¥ 3,015,940 ¥ 2,488,858  
Available-for-sale debt securities, Allowance for credit losses (634) (144) ¥ (153)
Available-for-sale debt securities, Gross unrealized gains 41,989 16,076  
Available-for-sale debt securities, Gross unrealized losses (391,817) (270,182)  
Available-for-sale debt securities, Fair value 2,665,478 2,234,608  
Held-to-maturity securities, Amortized cost [1] 0 114,759  
Total amortized cost   2,603,617  
Total allowance for credit losses   (144)  
Total gross unrealized gains   30,995  
Total gross unrealized losses   (270,182)  
Total fair values   2,364,286  
Japanese and foreign government bond securities      
Schedule of Investments [Line Items]      
Available-for-sale debt securities, Amortized cost 1,299,025 962,969  
Available-for-sale debt securities, Allowance for credit losses 0 0  
Available-for-sale debt securities, Gross unrealized gains 11,526 2,863  
Available-for-sale debt securities, Gross unrealized losses (275,637) (164,537)  
Available-for-sale debt securities, Fair value 1,034,914 801,295  
Japanese prefectural and foreign municipal bond securities      
Schedule of Investments [Line Items]      
Available-for-sale debt securities, Amortized cost 425,426 389,150  
Available-for-sale debt securities, Allowance for credit losses (248) (144)  
Available-for-sale debt securities, Gross unrealized gains 2,623 1,146  
Available-for-sale debt securities, Gross unrealized losses (26,336) (20,906)  
Available-for-sale debt securities, Fair value 401,465 369,246  
Corporate debt securities      
Schedule of Investments [Line Items]      
Available-for-sale debt securities, Amortized cost 905,706 851,525  
Available-for-sale debt securities, Allowance for credit losses 0 0  
Available-for-sale debt securities, Gross unrealized gains 21,415 6,270  
Available-for-sale debt securities, Gross unrealized losses (82,542) (73,407)  
Available-for-sale debt securities, Fair value 844,579 784,388  
CMBS and RMBS in the Americas      
Schedule of Investments [Line Items]      
Available-for-sale debt securities, Amortized cost 88,586 45,292  
Available-for-sale debt securities, Allowance for credit losses 0 0  
Available-for-sale debt securities, Gross unrealized gains 929 62  
Available-for-sale debt securities, Gross unrealized losses (1,775) (2,181)  
Available-for-sale debt securities, Fair value 87,740 43,173  
Other asset-backed securities and debt securities      
Schedule of Investments [Line Items]      
Available-for-sale debt securities, Amortized cost 297,197 239,922  
Available-for-sale debt securities, Allowance for credit losses (386) 0  
Available-for-sale debt securities, Gross unrealized gains 5,496 5,735  
Available-for-sale debt securities, Gross unrealized losses (5,527) (9,151)  
Available-for-sale debt securities, Fair value ¥ 296,780 236,506  
Japanese government bond securities and other      
Schedule of Investments [Line Items]      
Held-to-maturity securities, Amortized cost   114,759  
Held-to-maturity securities, Allowance for credit losses   0  
Held-to-maturity securities, Gross unrealized gains   14,919  
Held-to-maturity securities, Gross unrealized losses   0  
Held-to-maturity securities, Fair value   ¥ 129,678  
[1] During fiscal 2024, bonds held as held-to-maturity debt securities were reclassified to available-for-sale debt securities. This is because a certain subsidiary changed its holding purposes in accordance with ASC 320 (“Investments—Debt Securities”) in order to improve profitability by building a flexible investment portfolio and improve capital stability. At the time of reclassification, the book value of held-to-maturity debt securities was ¥115,507 million and the related unrealized gain was ¥7,913 million.