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Fair Value Measurements (Recorded Amounts of Major Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Aggregate loan fair value ¥ 90,893 ¥ 38,671  
Investment in securities, measured at fair value 25,295 27,367  
Other assets 18,206 12,449  
Policy liabilities and Policy Account Balances 300,739 360,198  
Loans Held-for-Sale      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Aggregate unpaid loan principal balance 90,893 38,671  
Aggregate loan fair value 84,906 37,865  
Reinsurance Recoverable      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Other assets 18,206 12,449 [1]  
Variable Annuity and Variable Life Insurance Contracts      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Policy liabilities and Policy Account Balances 300,739 360,198  
Equity securities | Investment funds      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Gains (losses) from change in fair value 1,225 1,141 ¥ 1,456
Investment in securities, measured at fair value 6,326 5,811  
Investment in securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Amount by which aggregate fair value of loan exceeds aggregate unpaid principal balance 780 420  
Investment in securities, measured at fair value 11,631 12,100  
Foreign government bond securities | Available-for-sale securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Gains (losses) from change in fair value (8) (19) (12)
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Gains (losses) from changes in instrument-specific credit risk 0 0 0
Amount by which aggregate fair value of loan exceeds aggregate unpaid principal balance 5,987 806  
Other assets 18,206 12,449  
Policy liabilities and Policy Account Balances 300,739 360,198  
Fair Value, Measurements, Recurring | Loans Held-for-Sale      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Gains (losses) from change in fair value 5,220 401 (663)
Investment in securities, measured at fair value [2] 90,893 38,671  
Fair Value, Measurements, Recurring | Available-for-sale securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Investment in securities, measured at fair value   1,264,244  
Fair Value, Measurements, Recurring | Reinsurance Recoverable      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Other assets [1] 18,206    
Fair Value, Measurements, Recurring | Variable Annuity and Variable Life Insurance Contracts      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Policy liabilities and Policy Account Balances [3] 300,739 360,198  
Fair Value, Measurements, Recurring | Equity securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Investment in securities, measured at fair value [4],[5] 375,174 425,593  
Foreign Corporate Debt Securities | Fair Value, Measurements, Recurring | Available-for-sale securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Gains (losses) from change in fair value (210) (784) ¥ (181)
Investment in securities, measured at fair value ¥ 18,189 ¥ 21,136  
[1] Certain subsidiaries elected the fair value option for certain reinsurance contracts held. The fair value of the reinsurance contracts elected for the fair value option in other assets were ¥12,449 million and ¥18,206 million as of March 31, 2019 and 2020, respectively. For the effect of changes in the fair value of those reinsurance contracts on earnings for fiscal 2018, 2019 and 2020, see Note 26 “Life Insurance Operations.”
[2] A certain subsidiary elected the fair value option on certain loans held for sale. These loans are multi-family and seniors housing loans and are sold to Federal National Mortgage Association (“Fannie Mae”), Federal Home Loan Mortgage Corporation (“Freddie Mac”) and institutional investors. Included in “Other (income) and expense” in the consolidated statements of income were a loss of ¥663 million, gains of ¥401 million and ¥5,220 million from the change in the fair value of the loans for fiscal 2018, 2019 and 2020,respectively. No gains or losses were recognized in earnings during fiscal 2018, 2019 and 2020 attributable to changes in instrument-specific credit risk. The amounts of aggregate unpaid principal balance and aggregate fair value of the loans held for sale as of March 31, 2019, were ¥37,865 million and ¥38,671 million, respectively, and the amount of the aggregate fair value exceeded the amount of aggregate unpaid principal balance by ¥806 million. The amounts of aggregate unpaid principal balance and aggregate fair value of the loans held for sale as of March 31, 2020, were ¥84,906 million and ¥90,893 million, respectively, and the amount of the aggregate fair value exceeded the amount of aggregate unpaid principal balance by ¥5,987 million. As of March 31, 2019 and 2020, there were no loans that are 90 days or more past due or, in non-accrual status.
[3] Certain subsidiaries elected the fair value option for the entire variable annuity and variable life insurance contracts held. The fair value of the variable annuity and variable life insurance contracts elected for the fair value option in policy liabilities and policy account balances were ¥360,198 million and ¥300,739 million as of March 31, 2019 and 2020, respectively. For the effect of changes in the fair value of the variable annuity and variable life insurance contracts on earnings for fiscal 2018, 2019 and 2020, see Note 26 “Life Insurance Operations.”
[4] Certain subsidiaries elected the fair value option for certain investments in investment funds included in equity securities. Included in “Gains on investment securities and dividends” in the consolidated statements of income were gains of ¥1,456 million, ¥1,141 million and ¥1,225 million from the change in the fair value of those investments for fiscal 2018, 2019 and 2020, respectively. The amounts of aggregate fair value elected the fair value option were ¥5,811 million and ¥6,326 million as of March 31, 2019 and 2020, respectively.
[5] The amounts of investment funds measured at net asset value per share which are not included in the above tables were ¥12,100 million and ¥11,631 million as of March 31, 2019 and 2020, respectively.