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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
Sep. 30, 2023
Mar. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value ¥ 100,941 ¥ 72,398
Derivative liabilities, Fair value 100,544 71,366
Interest rate swap agreements | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 603,623 568,864
Interest rate swap agreements | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 26,777 22,798
Interest rate swap agreements | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 3,169 3,311
Interest rate swap agreements | Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 2,122 464
Interest rate swap agreements | Derivatives not designated as hedging instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 165 0
Interest rate swap agreements | Derivatives not designated as hedging instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 8 8
Options held/written and other | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 14,541 9,486
Options held/written and other | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 44 52
Options held/written and other | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 886 88
Options held/written and other | Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 564,816 632,211
Options held/written and other | Derivatives not designated as hedging instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 33,397 30,435
Options held/written and other | Derivatives not designated as hedging instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 29,818 28,335
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 972,031 933,988
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 2,613 2,735
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 51,029 26,217
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 871,149 [1] 788,361 [2]
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 37,446 [1] 15,050 [2]
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 8,797 [1] 10,978 [2]
Foreign currency swap agreements | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 107,406 99,878
Foreign currency swap agreements | Derivatives designated as hedging instruments and other | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 491 1,325
Foreign currency swap agreements | Derivatives designated as hedging instruments and other | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value 6,831 2,426
Foreign currency long-term debt | Derivatives designated as hedging instruments and other    
Derivatives, Fair Value [Line Items]    
Notional amount 817,200 748,396
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 held/written | Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Notional amount 1,979 1,098
Credit derivatives held/written | Derivatives not designated as hedging instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets, Fair value 8 3
Credit derivatives held/written | Derivatives not designated as hedging instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, Fair value ¥ 6 ¥ 3
[1] The notional amounts of futures and foreign exchange contracts in the above table include futures contracts of ¥10,229 million and foreign exchange contracts of ¥3,622 million to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts at September 30, 2023, respectively. Derivative assets in the above table include fair value of the futures and foreign exchange contracts before offsetting of ¥144 million and ¥19 million and derivative liabilities include fair value of the futures and foreign exchange contracts before offsetting of ¥3 million and ¥168 million at September 30, 2023, respectively.
[2] The notional amounts of futures and foreign exchange contracts in the above table include futures contracts of ¥14,758 million and foreign exchange contracts of ¥5,554 million to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts at March 31, 2023, respectively. Derivative assets in the above table include fair value of the futures and foreign exchange contracts before offsetting of ¥52 million and ¥12 million and derivative liabilities include fair value of the futures and foreign exchange contracts before offsetting of ¥200 million and ¥179 million at March 31, 2023, respectively.