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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 | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Loans held for sale |  | ¥ 85,724 | ¥ 97,694
Trading debt securities |  | 834 | 0
Available-for-sale debt securities |  | 2,703,054 | 2,607,637
Derivative assets, gross amounts recognized |  | 84,038 | 64,170
Netting |  | (37,649) | (20,495)
Net derivative assets |  | ¥ 46,389 | ¥ 43,675
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Assets | Assets
Other assets |  | ¥ 1,515 | ¥ 2,586
Derivative liabilities, gross amounts recognized |  | 74,391 | 56,038
Netting |  | (37,649) | (20,495)
Net derivative Liabilities |  | 36,742 | 35,543
Policy liabilities and Policy Account Balances |  | 142,700 | 136,257
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Loans held for sale | [1] | 85,724 | 97,694
Trading debt securities |  | 834 |
Available-for-sale debt securities |  | 2,703,054 | 2,607,637
Equity securities | [2],[3] | 446,978 | 418,690
Derivative assets, gross amounts recognized |  | 84,038 | 64,170
Netting | [4] | (37,649) | (20,495)
Net derivative assets |  | 46,389 | 43,675
Other assets |  | 1,515 | 2,586
Total financial assets |  | 3,322,143 | 3,190,777
Derivative liabilities, gross amounts recognized |  | 74,391 | 56,038
Netting | [4] | (37,649) | (20,495)
Net derivative Liabilities |  | 36,742 | 35,543
Policy liabilities and Policy Account Balances |  | 142,700 | 136,257
Accounts Payable |  | 18,168 | 15,259
Contingent Consideration |  | 18,168 | 15,259
Total financial liabilities |  | 235,259 | 207,554
Interest rate swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 17,841 | 17,869
Derivative liabilities, gross amounts recognized |  | 2,845 | 2,774
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 |  | 15,878 | 15,767
Derivative liabilities, gross amounts recognized |  | 19,618 | 13,715
Futures, foreign exchange contracts | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 34,213 | 20,964
Derivative liabilities, gross amounts recognized |  | 51,354 | 39,387
Foreign currency swap agreements | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 16,098 | 9,570
Derivative liabilities, gross amounts recognized |  | 573 | 159
Credit derivatives held | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 8 |
Credit derivatives written | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative liabilities, gross amounts recognized |  | 1 | 3
Reinsurance recoverables |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Other assets |  | 1,515 | 2,586
Reinsurance recoverables | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Other assets | [5] | 1,515 | 2,586
Variable annuity and variable life insurance contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Policy liabilities and Policy Account Balances |  | 142,700 | 136,257
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] | 142,700 | 136,257
Japanese and foreign government bond securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,058,282 | 1,092,526
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] | 1,058,282 | 1,092,526
Japanese prefectural and foreign municipal bond securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 409,965 | 406,830
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 |  | 409,965 | 406,830
Corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 941,119 | 802,545
Corporate debt securities | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [8] | 941,119 | 802,545
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 |  | 132,296 | 106,751
Other asset-backed securities and debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 161,392 | 198,985
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 |  | 161,392 | 198,985
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Trading debt securities |  | 0 |
Available-for-sale debt securities |  | 8,917 | 12,243
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
Trading debt securities |  | 0 |
Available-for-sale debt securities |  | 8,917 | 12,243
Equity securities | [2],[3] | 127,195 | 137,014
Derivative assets, gross amounts recognized |  | 61 | 361
Other assets |  | 0 | 0
Total financial assets |  | 136,173 | 149,618
Derivative liabilities, gross amounts recognized |  | 200 | 129
Policy liabilities and Policy Account Balances |  | 0 | 0
Accounts Payable |  | 0 | 0
Contingent Consideration |  | 0 | 0
Total financial liabilities |  | 200 | 129
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 |  | 61 | 361
Derivative liabilities, gross amounts recognized |  | 200 | 129
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 held | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 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] | 3,705 | 7,510
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] | 5,212 | 4,733
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] |  |  |
Trading debt securities |  | 834 |
Available-for-sale debt securities |  | 2,401,367 | 2,377,740
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] | 33,128 | 29,900
Trading debt securities |  | 834 |
Available-for-sale debt securities |  | 2,401,367 | 2,377,740
Equity securities | [2],[3] | 136,746 | 119,466
Derivative assets, gross amounts recognized |  | 75,132 | 54,992
Other assets |  | 0 | 0
Total financial assets |  | 2,647,207 | 2,582,098
Derivative liabilities, gross amounts recognized |  | 73,410 | 55,257
Policy liabilities and Policy Account Balances |  | 0 | 0
Accounts Payable |  | 0 | 0
Contingent Consideration |  | 0 | 0
Total financial liabilities |  | 73,410 | 55,257
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 |  | 17,841 | 17,869
Derivative liabilities, gross amounts recognized |  | 2,845 | 2,774
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 |  | 7,033 | 6,950
Derivative liabilities, gross amounts recognized |  | 18,837 | 13,063
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 |  | 34,152 | 20,603
Derivative liabilities, gross amounts recognized |  | 51,154 | 39,258
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 |  | 16,098 | 9,570
Derivative liabilities, gross amounts recognized |  | 573 | 159
Level 2 | Credit derivatives held | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 8 |
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 |  | 1 | 3
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] | 1,054,577 | 1,085,016
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 |  | 399,548 | 395,952
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] | 815,639 | 793,560
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 |  | 125,258 | 99,669
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 |  | 6,345 | 3,543
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Trading debt securities |  | 0 |
Available-for-sale debt securities |  | 292,770 | 217,654
Contingent Consideration |  | 18,168 | 15,259
Level 3 | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Loans held for sale | [1] | 52,596 | 67,794
Trading debt securities |  | 0 |
Available-for-sale debt securities |  | 292,770 | 217,654
Equity securities | [2],[3] | 183,037 | 162,210
Derivative assets, gross amounts recognized |  | 8,845 | 8,817
Other assets |  | 1,515 | 2,586
Total financial assets |  | 538,763 | 459,061
Derivative liabilities, gross amounts recognized |  | 781 | 652
Policy liabilities and Policy Account Balances |  | 142,700 | 136,257
Accounts Payable |  | 18,168 | 15,259
Contingent Consideration |  | 18,168 | 15,259
Total financial liabilities |  | 161,649 | 152,168
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 |  | 8,845 | 8,817
Derivative liabilities, gross amounts recognized |  | 781 | 652
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 held | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Derivative assets, gross amounts recognized |  | 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] | 1,515 | 2,586
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] | 142,700 | 136,257
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 |  | 10,417 | 10,878
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] | 120,268 | 4,252
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 |  | 7,038 | 7,082
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 |  | ¥ 155,047 | ¥ 195,442
[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 gain of ¥451 million and a loss of ¥1,077 million from the change in the fair value of the loans for the six months ended September 30, 2024 and 2025, respectively. No gains or losses were recognized in earnings during the six months ended September 30, 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, 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. The amounts of aggregate unpaid principal balance and aggregate fair value of the loans held for sale as of September 30, 2025, were ¥85,865 million and ¥85,724 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥141 million. 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. 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 September 30, 2025, were ¥11,635 million and ¥11,192 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥443 million.
[2] | 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” and “Life insurance premiums and related investment income” in the consolidated statements of income were gains of ¥1,799 million and ¥1,206 million from the change in the fair value of those investments for the six months ended September 30, 2024 and 2025, respectively. The amounts of aggregate fair value elected the fair value option were ¥24,960 million and ¥24,488 million as of March 31, 2025 and September 30, 2025, respectively.
[3] | The amounts of investment funds measured at net asset value per share which are not included in the above tables were ¥118,666 million and ¥140,587 million as of March 31, 2025 and September 30, 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 ¥2,586 million and ¥1,515 million as of March 31, 2025 and September 30, 2025, respectively. For the effect of changes in the fair value of those reinsurance contracts on earnings during the six months ended September 30, 2024 and 2025, see Note 17 “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 ¥136,257 million and ¥142,700 million as of March 31, 2025 and September 30, 2025, respectively. For the effect of changes in the fair value of the variable annuity and variable life insurance contracts on earnings during the six months ended September 30, 2024 and 2025, see Note 17 “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 gains of ¥41 million and ¥90 million from the change in the fair value of those investments for the six months ended September 30, 2024 and 2025, respectively. The amounts of aggregate fair value elected the fair value option were ¥5,379 million and ¥5,335 million as of March 31, 2025 and September 30, 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 gains of ¥415 million and ¥365 million from the change in the fair value of those investments for the six months ended September 30, 2024 and 2025, respectively. The amounts of aggregate fair value elected the fair value option were ¥10,679 million and ¥11,676 million as of March 31, 2025 and September 30, 2025, respectively.

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