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Investment in Securities (Summary of Investment in Securities) (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2023
Mar. 31, 2023
Schedule of Investments [Line Items]    
Equity securities ¥ 26,848 ¥ 22,874
Equity securities [1] 751,872 589,312
Investment Funds Elected for Fair Value Option    
Schedule of Investments [Line Items]    
Equity securities 19,401 16,032
Variable Annuity and Variable Life Insurance Contracts    
Schedule of Investments [Line Items]    
Equity securities 151,281 151,445
Investment funds that are accounted for under the equity method    
Schedule of Investments [Line Items]    
Equity securities ¥ 196,899 ¥ 90,993
[1] The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥151,445 million and ¥151,281 million as of March 31, 2023 and September 30, 2023, respectively. The amount of investment funds that are accounted for under the equity method included in equity securities were ¥90,993 million and ¥196,899 million as of March 31, 2023 and September 30, 2023, respectively. The amount of investment funds elected the fair value option included in equity securities were ¥16,032 million and ¥19,401 million as of March 31, 2023 and September 30, 2023, respectively.