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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Aggregate loan fair value ¥ 129,959 ¥ 197,041  
Other assets 2,786 4,676  
Policy liabilities and Policy Account Balances 167,207 163,734  
Reinsurance recoverables      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Other assets 2,786 4,676  
Variable Annuity and Variable Life Insurance Contracts      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Policy liabilities and Policy Account Balances 167,207 163,734  
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Aggregate loan fair value [1] 129,959 197,041  
Other assets 2,786 4,676  
Policy liabilities and Policy Account Balances 167,207 163,734  
Fair Value, Measurements, Recurring | Reinsurance recoverables      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Other assets [2] 2,786 4,676  
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] 167,207 163,734  
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 428 (2,429) ¥ (2,982)
Gains (losses) from changes in instrument-specific credit risk 0 0 0
Aggregate unpaid loan principal balance 130,554 199,674  
Aggregate loan fair value 129,959 197,041  
Amount by which aggregate fair value of loan was less than aggregate unpaid loan principal balance 595 2,633  
Fair Value, Measurements, Recurring | Japanese and foreign government bond securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Gains (losses) from change in fair value (6) (11) 51
Fair Value, Measurements, Recurring | Japanese and foreign government bond securities | Fair value option      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Amounts aggregate fair value elected fair value option 1,000 237  
Fair Value, Measurements, Recurring | Corporate debt securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Gains (losses) from change in fair value 399 (516) (365)
Fair Value, Measurements, Recurring | Corporate debt securities | Fair value option      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Amounts aggregate fair value elected fair value option 7,751 6,605  
Fair Value, Measurements, Recurring | Equity securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Gains (losses) from change in fair value 3,269 1,066 ¥ 1,199
Fair Value, Measurements, Recurring | Equity securities | Fair value option      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Amounts aggregate fair value elected fair value option 26,945 18,544  
Amounts investment funds measured at net asset value per share are not included in above tables ¥ 85,280 ¥ 51,263  
[1] 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 losses of ¥2,982 million, ¥2,429 million and a gain of ¥428 million from the change in the fair value of the loans for fiscal 2022, 2023 and 2024, respectively. No gains or losses were recognized in earnings during fiscal 2022, 2023 and 2024 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, 2023, were ¥199,674 million and ¥197,041 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥2,633 million. The amounts of aggregate unpaid principal balance and aggregate fair value of the loans held for sale as of March 31, 2024, were ¥130,554 million and ¥129,959 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥595 million. As of March 31, 2023 and 2024, there were no loans that are 90 days or more past due or, in non-accrual status.
[2] 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 ¥4,676 million and ¥2,786 million as of March 31, 2023 and 2024, respectively. For the effect of changes in the fair value of those reinsurance contracts on earnings for fiscal 2022, 2023 and 2024, see Note 23 “Income and Expenses Relating to Life Insurance Operations.”
[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 ¥163,734 million and ¥167,207 million as of March 31, 2023 and 2024, respectively. For the effect of changes in the fair value of the variable annuity and variable life insurance contracts on earnings for fiscal 2022, 2023 and 2024, see Note 23 “Income and Expenses Relating to Life Insurance Operations.”