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Fair Value Measurements (Recorded Amounts of Major Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Loans held for sale |  | ¥ 97,694 | ¥ 129,959
Available-for-sale debt securities |  | 2,607,637 | 2,665,478
Derivative assets, gross amounts recognized |  | 64,170 | 72,986
Netting |  | (20,495) | (47,496)
Net derivative assets |  | ¥ 43,675 | ¥ 25,490
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Assets | Assets
Other assets |  | ¥ 2,586 | ¥ 2,786
Derivative liabilities, gross amounts recognized |  | 56,038 | 95,686
Netting |  | (20,495) | (47,496)
Net derivative Liabilities |  | 35,543 | 48,190
Policy liabilities and Policy Account Balances |  | 136,257 | 167,207
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Loans held for sale | [1] | 97,694 | 129,959
Available-for-sale debt securities |  | 2,607,637 | 2,665,478
Equity securities | [2],[3] | 418,690 | 415,607
Derivative assets, gross amounts recognized |  | 64,170 | 72,986
Netting | [4] | (20,495) | (47,496)
Net derivative assets |  | 43,675 | 25,490
Other assets |  | 2,586 | 2,786
Total financial assets |  | 3,190,777 | 3,286,816
Derivative liabilities, gross amounts recognized |  | 56,038 | 95,686
Netting | [4] | (20,495) | (47,496)
Net derivative Liabilities |  | 35,543 | 48,190
Policy liabilities and Policy Account Balances |  | 136,257 | 167,207
Accounts Payable |  | 15,259 | 14,136
Contingent Consideration |  | 15,259 | 14,136
Total financial liabilities |  | 207,554 | 277,029
Interest rate swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 17,869 | 18,995
Derivative liabilities, gross amounts recognized |  | 2,774 | 3,728
Options held/written and other | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 15,767 | 15,349
Derivative liabilities, gross amounts recognized |  | 13,715 | 14,394
Futures, foreign exchange contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 20,964 | 38,172
Derivative liabilities, gross amounts recognized |  | 39,387 | 70,997
Foreign currency swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 9,570 | 470
Derivative liabilities, gross amounts recognized |  | 159 | 6,563
Credit derivatives written | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative liabilities, gross amounts recognized |  | 3 | 4
Reinsurance recoverables |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Other assets |  | 2,586 | 2,786
Reinsurance recoverables | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Other assets | [5] | 2,586 | 2,786
Variable annuity and variable life insurance contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Policy liabilities and Policy Account Balances |  | 136,257 | 167,207
Variable annuity and variable life insurance contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Policy liabilities and Policy Account Balances | [6] | 136,257 | 167,207
Japanese and foreign government bond securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,092,526 | 1,034,914
Japanese and foreign government bond securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [7] | 1,092,526 | 1,034,914
Japanese prefectural and foreign municipal bond securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 406,830 | 401,465
Japanese prefectural and foreign municipal bond securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 406,830 | 401,465
Corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 802,545 | 844,579
Corporate debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [8] | 802,545 | 844,579
CMBS and RMBS in the Americas | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 106,751 | 87,740
Other asset-backed securities and debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 198,985 | 296,780
Other asset-backed securities and debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 198,985 | 296,780
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 12,243 | 11,491
Net derivative assets | [9] |  |
Net derivative Liabilities | [9] |  |
Contingent Consideration |  | 0 | 0
Level 1 | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Loans held for sale | [1] | 0 | 0
Available-for-sale debt securities |  | 12,243 | 11,491
Equity securities | [2],[3] | 137,014 | 108,964
Derivative assets, gross amounts recognized |  | 361 | 52
Other assets |  | 0 | 0
Total financial assets |  | 149,618 | 120,507
Derivative liabilities, gross amounts recognized |  | 129 | 607
Policy liabilities and Policy Account Balances |  | 0 | 0
Accounts Payable |  | 0 | 0
Contingent Consideration |  | 0 | 0
Total financial liabilities |  | 129 | 607
Level 1 | Interest rate swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 0 | 0
Derivative liabilities, gross amounts recognized |  | 0 | 0
Level 1 | Options held/written and other | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 0 | 0
Derivative liabilities, gross amounts recognized |  | 0 | 0
Level 1 | Futures, foreign exchange contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 361 | 52
Derivative liabilities, gross amounts recognized |  | 129 | 607
Level 1 | Foreign currency swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 0 | 0
Derivative liabilities, gross amounts recognized |  | 0 | 0
Level 1 | Credit derivatives written | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative liabilities, gross amounts recognized |  | 0 | 0
Level 1 | Reinsurance recoverables | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Other assets | [5] | 0 | 0
Level 1 | Variable annuity and variable life insurance contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Policy liabilities and Policy Account Balances | [6] | 0 | 0
Level 1 | Japanese and foreign government bond securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [7] | 7,510 | 4,303
Level 1 | Japanese prefectural and foreign municipal bond securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Corporate debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [8] | 4,733 | 7,188
Level 1 | CMBS and RMBS in the Americas | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Other asset-backed securities and debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,377,740 | 2,334,690
Net derivative assets | [9] |  |
Net derivative Liabilities | [9] |  |
Contingent Consideration |  | 0 | 0
Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Loans held for sale | [1] | 29,900 | 33,393
Available-for-sale debt securities |  | 2,377,740 | 2,334,690
Equity securities | [2],[3] | 119,466 | 143,786
Derivative assets, gross amounts recognized |  | 54,992 | 66,433
Other assets |  | 0 | 0
Total financial assets |  | 2,582,098 | 2,578,302
Derivative liabilities, gross amounts recognized |  | 55,257 | 90,862
Policy liabilities and Policy Account Balances |  | 0 | 0
Accounts Payable |  | 0 | 0
Contingent Consideration |  | 0 | 0
Total financial liabilities |  | 55,257 | 90,862
Level 2 | Interest rate swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 17,869 | 18,995
Derivative liabilities, gross amounts recognized |  | 2,774 | 3,728
Level 2 | Options held/written and other | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 6,950 | 8,848
Derivative liabilities, gross amounts recognized |  | 13,063 | 10,177
Level 2 | Futures, foreign exchange contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 20,603 | 38,120
Derivative liabilities, gross amounts recognized |  | 39,258 | 70,390
Level 2 | Foreign currency swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 9,570 | 470
Derivative liabilities, gross amounts recognized |  | 159 | 6,563
Level 2 | Credit derivatives written | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative liabilities, gross amounts recognized |  | 3 | 4
Level 2 | Reinsurance recoverables | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Other assets | [5] | 0 | 0
Level 2 | Variable annuity and variable life insurance contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Policy liabilities and Policy Account Balances | [6] | 0 | 0
Level 2 | Japanese and foreign government bond securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [7] | 1,085,016 | 1,030,611
Level 2 | Japanese prefectural and foreign municipal bond securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 395,952 | 390,543
Level 2 | Corporate debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [8] | 793,560 | 831,805
Level 2 | CMBS and RMBS in the Americas | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 99,669 | 80,575
Level 2 | Other asset-backed securities and debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 3,543 | 1,156
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 217,654 | 319,297
Net derivative assets | [9] |  |
Net derivative Liabilities | [9] |  |
Contingent Consideration |  | 15,259 | 14,136
Level 3 | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Loans held for sale | [1] | 67,794 | 96,566
Available-for-sale debt securities |  | 217,654 | 319,297
Equity securities | [2],[3] | 162,210 | 162,857
Derivative assets, gross amounts recognized |  | 8,817 | 6,501
Other assets |  | 2,586 | 2,786
Total financial assets |  | 459,061 | 588,007
Derivative liabilities, gross amounts recognized |  | 652 | 4,217
Policy liabilities and Policy Account Balances |  | 136,257 | 167,207
Accounts Payable |  | 15,259 | 14,136
Contingent Consideration |  | 15,259 | 14,136
Total financial liabilities |  | 152,168 | 185,560
Level 3 | Interest rate swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 0 | 0
Derivative liabilities, gross amounts recognized |  | 0 | 0
Level 3 | Options held/written and other | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 8,817 | 6,501
Derivative liabilities, gross amounts recognized |  | 652 | 4,217
Level 3 | Futures, foreign exchange contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 0 | 0
Derivative liabilities, gross amounts recognized |  | 0 | 0
Level 3 | Foreign currency swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 0 | 0
Derivative liabilities, gross amounts recognized |  | 0 | 0
Level 3 | Credit derivatives written | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative liabilities, gross amounts recognized |  | 0 | 0
Level 3 | Reinsurance recoverables | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Other assets | [5] | 2,586 | 2,786
Level 3 | Variable annuity and variable life insurance contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Policy liabilities and Policy Account Balances | [6] | 136,257 | 167,207
Level 3 | Japanese and foreign government bond securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [7] | 0 | 0
Level 3 | Japanese prefectural and foreign municipal bond securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 10,878 | 10,922
Level 3 | Corporate debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [8] | 4,252 | 5,586
Level 3 | CMBS and RMBS in the Americas | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 7,082 | 7,165
Level 3 | Other asset-backed securities and debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | ¥ 195,442 | ¥ 295,624
[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 a loss of ¥2,429 million, a gain of ¥428 million and a loss of ¥1,052 million from the change in the fair value of the loans for fiscal 2023, 2024 and 2025,respectively. No gains or losses were recognized in earnings during fiscal 2023, 2024 and 2025 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, 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. The amounts of aggregate unpaid principal balance and aggregate fair value of the loans held for sale as of March 31, 2025, were ¥98,135 million and ¥97,694 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥441 million. As of March 31, 2024, there were no loans that are 90 days or more past due or, in non-accrual status. The amounts of aggregate unpaid principal balance and aggregate fair value of loans that are 90 days or more past due or, in non-accrual status as of March 31, 2025, were ¥17,098 million and ¥16,346 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥752 million.
[2] | Certain subsidiaries elected the fair value option for certain investments in investment funds, and others included in equity securities. Included in “Gains on investment securities and dividends” and “Life insurance premiums and related investment income” in the consolidated statements of income were gains of ¥1,066 million, ¥3,269 million and ¥1,954 million from the change in the fair value of those investments for fiscal 2023, 2024 and 2025, respectively. The amounts of aggregate fair value elected the fair value option were ¥26,945 million and ¥24,960 million as of March 31, 2024 and 2025, respectively.
[3] | The amounts of investment funds measured at net asset value per share which are not included in the above tables were ¥85,280 million and ¥118,666 million as of March 31, 2024 and 2025, respectively.
[4] | It represents the amount offset under counterparty netting of derivative assets and liabilities.
[5] | 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 ¥2,786 million and ¥2,586 million as of March 31, 2024 and 2025, respectively. For the effect of changes in the fair value of those reinsurance contracts on earnings for fiscal 2023, 2024 and 2025, see Note 23 “Income and Expenses Relating to Life Insurance Operations.”
[6] | 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 ¥167,207 million and ¥136,257 million as of March 31, 2024 and 2025, respectively. For the effect of changes in the fair value of the variable annuity and variable life insurance contracts on earnings for fiscal 2023, 2024 and 2025, see Note 23 “Income and Expenses Relating to Life Insurance Operations.”
[7] | A certain subsidiary elected the fair value option for investments in foreign government bond securities included in available-for-sale debt securities. Included in “Gains on investment securities and dividends” in the consolidated statements of income were losses of ¥11 million, ¥6 million and ¥59 million from the change in the fair value of those investments for fiscal 2023, 2024 and 2025, respectively. The amount of aggregate fair value elected the fair value option were ¥1,000 million and ¥5,379 million as of March 31, 2024 and 2025, respectively.
[8] | A certain subsidiary elected the fair value option for investments in foreign corporate debt securities included in available-for-sale debt securities. Included in “Gains on investment securities and dividends” in the consolidated statements of income were a loss of ¥516 million, gains of ¥399 million and ¥441 million from the change in the fair value of those investments for fiscal 2023, 2024 and 2025, respectively. The amounts of aggregate fair value elected the fair value option were ¥7,751 million and ¥10,679 million as of March 31, 2024 and 2025, respectively.
[9] | It represents the amount after offset under counterparty netting of derivative assets and liabilities. For the information of input level before netting, see Note 2 “Fair Value Measurements.”

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