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Fair Value Measurements (Information about Valuation Techniques and Significant Unobservable Inputs Used in Valuation of Level Three Assets and Liabilities Measured at Fair Value on Recurring Basis) (Detail) ¥ in Millions | Sep. 30, 2025 JPY (¥) | Mar. 31, 2025 JPY (¥)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held for sale |  | ¥ 85,724 |  | ¥ 97,694 |
Available-for-sale debt securities |  | 2,703,054 |  | 2,607,637 |
Equity securities | [1] | 689,443 |  | 626,910 |
Derivative assets |  | 46,389 |  | 43,675 |
Other assets |  | 1,515 |  | 2,586 |
Derivative Liability |  | 36,742 |  | 35,543 |
Policy liabilities and Policy Account Balances |  | 142,700 |  | 136,257 |
Reinsurance recoverables |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other assets |  | 1,515 |  | 2,586 |
Variable annuity and variable life insurance contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Policy liabilities and Policy Account Balances |  | 142,700 |  | 136,257 |
Japanese prefectural and foreign municipal bond securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 409,965 |  | 406,830 |
Corporate debt securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 941,119 |  | 802,545 |
CMBS and RMBS in the Americas |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring 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 and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 161,392 |  | 198,985 |
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 292,770 |  | 217,654 |
Equity securities |  | 183,037 | [2] | 162,210 | [3]
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held for sale | [4] | 85,724 |  | 97,694 |
Available-for-sale debt securities |  | 2,703,054 |  | 2,607,637 |
Derivative assets |  | 46,389 |  | 43,675 |
Other assets |  | 1,515 |  | 2,586 |
Total |  | 3,322,143 |  | 3,190,777 |
Derivative Liability |  | 36,742 |  | 35,543 |
Policy liabilities and Policy Account Balances |  | 142,700 |  | 136,257 |
Accounts Payable |  | 18,168 |  | 15,259 |
Total financial liabilities |  | 235,259 |  | 207,554 |
Fair Value, Measurements, Recurring | Reinsurance recoverables |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other assets | [5] | 1,515 |  | 2,586 |
Fair Value, Measurements, Recurring | Variable annuity and variable life insurance contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Policy liabilities and Policy Account Balances | [6] | 142,700 |  | 136,257 |
Fair Value, Measurements, Recurring | Japanese prefectural and foreign municipal bond securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 409,965 |  | 406,830 |
Fair Value, Measurements, Recurring | Corporate debt securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities | [7] | 941,119 |  | 802,545 |
Fair Value, Measurements, Recurring | Other asset-backed securities and debt securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 161,392 |  | 198,985 |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held for sale | [4] | 52,596 |  | 67,794 |
Available-for-sale debt securities |  | 292,770 |  | 217,654 |
Other assets |  | 1,515 |  | 2,586 |
Total |  | 538,763 |  | 459,061 |
Policy liabilities and Policy Account Balances |  | 142,700 |  | 136,257 |
Accounts Payable |  | 18,168 |  | 15,259 |
Total financial liabilities |  | 161,649 |  | 152,168 |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held for sale |  | 52,596 |  | 67,794 |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity securities |  |  |  | 133,585 |
Fair Value, Measurements, Recurring | Level 3 | Appraisals/Broker quotes | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity securities |  |  |  | 22,859 |
Fair Value, Measurements, Recurring | Level 3 | Reinsurance recoverables |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other assets | [5] | 1,515 |  | 2,586 |
Fair Value, Measurements, Recurring | Level 3 | Reinsurance recoverables | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other assets |  | ¥ 1,515 |  | ¥ 2,586 |
Fair Value, Measurements, Recurring | Level 3 | Reinsurance recoverables | Annuitization Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 1 |  | 1 |
Fair Value, Measurements, Recurring | Level 3 | Variable annuity and variable life insurance contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Policy liabilities and Policy Account Balances | [6] | ¥ 142,700 |  | ¥ 136,257 |
Fair Value, Measurements, Recurring | Level 3 | Variable annuity and variable life insurance contracts | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Policy liabilities and Policy Account Balances |  | 142,700 |  | 136,257 |
Fair Value, Measurements, Recurring | Level 3 | Japanese prefectural and foreign municipal bond securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 10,417 |  | 10,878 |
Fair Value, Measurements, Recurring | Level 3 | Japanese prefectural and foreign municipal bond securities | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 5,996 |  | 6,319 |
Fair Value, Measurements, Recurring | Level 3 | Japanese prefectural and foreign municipal bond securities | Appraisals/Broker quotes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 4,421 |  | 4,559 |
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities | [7] | 120,268 |  | 4,252 |
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 116,025 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Appraisals/Broker quotes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 3,933 |  | 3,950 |
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | ¥ 310 |  | ¥ 302 |
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.055 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.016 |  | 0.015 |
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Equity Volatility | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.60 |  |  |
Fair Value, Measurements, Recurring | Level 3 | CMBS and RMBS in the Americas | Appraisals/Broker quotes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | ¥ 7,038 |  | ¥ 7,082 |
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed securities and debt securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 155,047 |  | 195,442 |
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed securities and debt securities | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | 41,268 |  | 34,670 |
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed securities and debt securities | Appraisals/Broker quotes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities |  | ¥ 113,779 |  | ¥ 160,772 |
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed securities and debt securities | Probability of default | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.002 |  | 0.002 |
Fair Value, Measurements, Recurring | Level 3 | Investment funds | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity securities |  | ¥ 5,741 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Investment funds | Appraisals/Broker quotes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity securities |  | 22,388 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Investment funds | Market Multiples |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity securities |  | ¥ 154,908 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Investment funds | EV/Forward EBITDA multiple | Market Multiples |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  | 7.4 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Certain investment funds | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity securities |  |  |  | ¥ 5,766 |
Fair Value, Measurements, Recurring | Level 3 | Contingent Consideration | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Accounts Payable |  | ¥ 16,679 |  | ¥ 15,259 |
Fair Value, Measurements, Recurring | Level 3 | Contingent Consideration | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Accounts Payable |  | ¥ 1,489 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Contingent Consideration | EBTDA Volatility | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Accounts Payable |  | 0.35 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Contingent Consideration | EV/Terminal EBITDA multiple | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Accounts Payable |  | 15 |  | 15 |
Fair Value, Measurements, Recurring | Level 3 | Options held/written and other | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative assets |  | ¥ 8,495 |  | ¥ 8,297 |
Derivative Liability |  | 781 |  | 652 |
Fair Value, Measurements, Recurring | Level 3 | Options held/written and other | Appraisals/Broker quotes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative assets |  | ¥ 350 |  | ¥ 520 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Loans held for sale |  | 0.068 |  | 0.07 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | WACC | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 0.133 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | EV/Terminal EBITDA multiple | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 4.2 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | EV/Last twelve months EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 4.3 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | EV/Forward EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 4.2 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 4.3 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Reinsurance recoverables | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 0.007 |  | 0.005 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Reinsurance recoverables | Mortality Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 0 |  | 0 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Reinsurance recoverables | Lapse Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 0.015 |  | 0.015 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Variable annuity and variable life insurance contracts | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0.007 |  | 0.005 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Variable annuity and variable life insurance contracts | Mortality Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0 |  | 0 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Variable annuity and variable life insurance contracts | Lapse Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0.015 |  | 0.015 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Variable annuity and variable life insurance contracts | Annuitization Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0 |  | 0 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Japanese prefectural and foreign municipal bond securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.042 |  | 0.058 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Other asset-backed securities and debt securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.004 |  | 0.004 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  | 0.115 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds | EV/Last twelve months EBITDA multiple | Market Multiples |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  | 3.5 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Certain investment funds | Discount rate | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 0.115 |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Contingent Consideration | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Accounts Payable |  | 0.048 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Minimum | Options held/written and other | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Derivative assets |  | 0.12 |  | 0.12 |
Significant unobservable inputs, Derivative liabilities |  | 0.12 |  | 0.12 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Loans held for sale |  | 0.113 |  | 0.121 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | WACC | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 0.237 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | EV/Terminal EBITDA multiple | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 12 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | EV/Last twelve months EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 9.5 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | EV/Forward EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 9 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 11.9 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Reinsurance recoverables | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 0.026 |  | 0.024 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Reinsurance recoverables | Mortality Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 1 |  | 1 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Reinsurance recoverables | Lapse Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 0.14 |  | 0.14 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Variable annuity and variable life insurance contracts | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0.026 |  | 0.024 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Variable annuity and variable life insurance contracts | Mortality Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 1 |  | 1 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Variable annuity and variable life insurance contracts | Lapse Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0.30 |  | 0.30 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Variable annuity and variable life insurance contracts | Annuitization Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 1 |  | 1 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Japanese prefectural and foreign municipal bond securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.098 |  | 0.098 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Other asset-backed securities and debt securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.512 |  | 0.512 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  | 0.12 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds | EV/Last twelve months EBITDA multiple | Market Multiples |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  | 9.3 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Certain investment funds | Discount rate | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 0.12 |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Contingent Consideration | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Accounts Payable |  | 0.05 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Maximum | Options held/written and other | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Derivative assets |  | 0.33 |  | 0.33 |
Significant unobservable inputs, Derivative liabilities |  | 0.33 |  | 0.33 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Loans held for sale |  | 0.088 |  | 0.094 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | WACC | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 0.168 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | EV/Terminal EBITDA multiple | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 8.8 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | EV/Last twelve months EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 7.8 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | EV/Forward EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 7.7 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 8.7 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Reinsurance recoverables | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 0.014 |  | 0.013 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Reinsurance recoverables | Mortality Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 0.032 |  | 0.029 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Reinsurance recoverables | Lapse Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 0.047 |  | 0.047 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Reinsurance recoverables | Annuitization Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Other assets |  | 1 |  | 1 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Variable annuity and variable life insurance contracts | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0.014 |  | 0.013 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Variable annuity and variable life insurance contracts | Mortality Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0.023 |  | 0.023 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Variable annuity and variable life insurance contracts | Lapse Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0.057 |  | 0.057 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Variable annuity and variable life insurance contracts | Annuitization Rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Policy liabilities and Policy Account Balances |  | 0.657 |  | 0.671 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Japanese prefectural and foreign municipal bond securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.078 |  | 0.08 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Corporate debt securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.055 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Corporate debt securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.016 |  | 0.015 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Corporate debt securities | Equity Volatility | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.60 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Other asset-backed securities and debt securities | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.053 |  | 0.055 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Other asset-backed securities and debt securities | Probability of default | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Available-for-sale debt securities |  | 0.002 |  | 0.002 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  | 0.117 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds | EV/Last twelve months EBITDA multiple | Market Multiples |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  | 8 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds | EV/Forward EBITDA multiple | Market Multiples |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  | 7.4 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Certain investment funds | Discount rate | Discounted cash flows | Investment funds, and others |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Equity securities |  |  |  | 0.117 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Contingent Consideration | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Accounts Payable |  | 0.049 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Contingent Consideration | EBTDA Volatility | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Accounts Payable |  | 0.35 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Contingent Consideration | EV/Terminal EBITDA multiple | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Accounts Payable |  | 15 |  | 15 |
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Options held/written and other | Discount rate | Discounted cash flows |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Significant unobservable inputs, Derivative assets |  | 0.148 |  | 0.147 |
Significant unobservable inputs, Derivative liabilities |  | 0.148 |  | 0.147 |
[1] | The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥132,313 million and ¥141,122 million as of March 31, 2025 and September 30, 2025, respectively. The amount of investment funds and others that elected the fair value option and were included in equity securities were ¥24,960 million and ¥24,488 million as of March 31, 2025 and September 30, 2025, respectively.
[2] | The amount of ¥140,587 million of investment funds measured at net asset value per share is not included.
[3] | The amount of ¥118,666 million of investment funds measured at net asset value per share is not included.
[4] | 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.
[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 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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