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Investment in Securities (Summary of Investment in Securities) (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Schedule of Investments [Line Items]    
Equity securities ¥ 35,696 ¥ 25,386
Equity securities [1] 597,601 500,832
Held-to-maturity debt securities [2] 0 114,759
Revision of Prior Period, Adjustment [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity debt securities 115,507  
Unrealized gain (loss) on investments 7,913  
Investment Funds Elected for Fair Value Option    
Schedule of Investments [Line Items]    
Equity securities 26,945 18,544
Variable Annuity and Variable Life Insurance Contracts    
Schedule of Investments [Line Items]    
Equity securities ¥ 161,244 ¥ 151,445
[1] The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥151,445 million and ¥161,244 million as of March 31, 2023 and 2024, respectively. The amount of investment funds and others elected the fair value option included in equity securities were ¥18,544 million and ¥26,945 million as of March 31, 2023 and 2024, respectively.
[2] 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.