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Derivative Financial Instruments and Hedging (Notional Amounts of Derivative Instruments and Other, Fair Values of Derivative Instruments and Other before Offsetting) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value ¥ 64,170 ¥ 72,986
Derivative liabilities, Fair value 56,038 95,686
Interest rate swap agreements | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 676,691 518,990
Interest rate swap agreements | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 17,788 18,889
Interest rate swap agreements | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 2,768 3,722
Interest rate swap agreements | Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 1,477 1,930
Interest rate swap agreements | Derivatives not designated as hedging instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 81 106
Interest rate swap agreements | Derivatives not designated as hedging instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 6 6
Options held/written and other | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 94,608 44,774
Options held/written and other | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 98 40
Options held/written and other | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 7,323 1,039
Options held/written and other | Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 582,939 468,422
Options held/written and other | Derivatives not designated as hedging instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 15,669 15,309
Options held/written and other | Derivatives not designated as hedging instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 6,392 13,355
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 932,649 958,260
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 9,515 2,841
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 25,445 63,703
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 1,592,590 [1] 646,085 [2]
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 11,449 [1] 35,331 [2]
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 13,942 [1] 7,294 [2]
Foreign currency swap agreements | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 303,060 113,962
Foreign currency swap agreements | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 9,570 470
Foreign currency swap agreements | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 159 6,563
Foreign currency long-term debt | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 250,702 849,630
Foreign currency long-term debt | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 0 0
Foreign currency long-term debt | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 0 0
Credit derivatives written | Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 1,000 1,000
Credit derivatives written | Derivatives not designated as hedging instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 0 0
Credit derivatives written | Derivatives not designated as hedging instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value ¥ 3 ¥ 4
[1] The notional amounts of futures and foreign exchange contracts in the above table include futures contracts of ¥0 million and foreign exchange contracts of ¥0 million to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts at March 31, 2025, respectively. Derivative assets in the above table include fair value of the futures and foreign exchange contracts before offsetting of ¥0 million and ¥0 million and derivative liabilities include fair value of the futures and foreign exchange contracts before offsetting of ¥0 million and ¥0 million at March 31, 2025, respectively.
[2]  The notional amounts of futures and foreign exchange contracts in the above table include futures contracts of ¥4,863 million and foreign exchange contracts of ¥524 million to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts at March 31, 2024, respectively. Derivative assets in the above table include fair value of the futures and foreign exchange contracts before offsetting of ¥0 million and ¥9 million and derivative liabilities include fair value of the futures and foreign exchange contracts before offsetting of ¥170 million and ¥94 million at March 31, 2024, respectively.