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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, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Aggregate loan fair value |  | ¥ 197,041 | ¥ 151,601 |
Policy liabilities and Policy Account Balances |  | 163,734 | 198,905 |
Reinsurance Recoverable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Policy liabilities and Policy Account Balances |  | 4,676 | 5,214 |
Variable Annuity and Variable Life Insurance Contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Policy liabilities and Policy Account Balances |  | 163,734 | 198,905 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Aggregate loan fair value | [1] | 197,041 | 151,601 |
Policy liabilities and Policy Account Balances |  | 163,734 | 198,905 |
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 | [2] | 163,734 | 198,905 |
Fair Value, Measurements, Recurring | Fair value option |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Gains (losses) from changes in instrument-specific credit risk |  | 0 | 0 | ¥ 0
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 |  | 2,429 | 2,982 | 3,260
Gains (losses) from changes in instrument-specific credit risk |  | 0 | 0 | 0
Aggregate unpaid loan principal balance |  | 199,674 | 151,672 |
Aggregate loan fair value |  | 197,041 | 151,601 |
Amount by which aggregate fair value of loan exceeds aggregate unpaid principal balance |  | (2,633) | (71) |
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 |  | (11) | 51 | (28)
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 |  | 237 | 0 |
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 |  | (516) | (365) | 1,080
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 |  | 6,605 | 7,644 |
Fair Value, Measurements, Recurring | Equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Gains (losses) from change in fair value |  | 1,066 | 1,199 | ¥ 3,187
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 |  | 16,032 | 11,709 |
Amounts investment funds measured at net asset value per share are not included in above tables |  | 51,263 | 25,999 |
Fair Value, Measurements, Recurring | Investment In Affiliates | Fair value option |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Amounts aggregate fair value elected fair value option |  | ¥ 2,511 | ¥ 0 |
[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 ¥3,260 million, ¥2,982 million and ¥2,429 million from the change in the fair value of the loans for fiscal 2021, 2022 and 2023, respectively. No gains or losses were recognized in earnings during fiscal 2021, 2022 and 2023 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, 2022, were ¥151,672 million and ¥151,601 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥71 million. 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. As of March 31, 2022 and 2023, 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 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 ¥198,905 million and ¥163,734 million as of March 31, 2022 and 2023, respectively. For the effect of changes in the fair value of the variable annuity and variable life insurance contracts on earnings for fiscal 2021, 2022 and 2023, see Note 23 “Life Insurance Operations.”

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