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Income and Expenses Relating to Life Insurance Operations - Gains or Losses Relating to Variable Annuity and Variable Life Insurance Contracts (Detail) - Variable Annuity and Variable Life Insurance Contracts - JPY (¥) ¥ in Millions | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Life insurance premiums and related investment income |  |
Net realized and unrealized gains or losses from investment assets | ¥ 21,706 | ¥ (2,704)
Net gains or losses from derivative contracts | (1,148) | (131)
Life insurance costs |  |
Changes in the fair value of the policy liabilities and policy account balances | 6,707 | (15,980)
Insurance costs recognized for insurance and annuity payouts as a result of insured events | 10,571 | 11,839
Changes in the fair value of the reinsurance contracts | 1,071 | (73)
Futures |  |
Life insurance premiums and related investment income |  |
Net gains or losses from derivative contracts | (1,106) | (141)
Foreign exchange contracts |  |
Life insurance premiums and related investment income |  |
Net gains or losses from derivative contracts | ¥ (42) | ¥ 10

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- Definition Amount of increase (decrease) in the fair value of reinsurance contracts in the income statement. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of variable annuity and variable life insurance contracts. + References No definition available. + Details
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- Definition Life Insurance Costs [Abstract] + References No definition available. + Details
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- Definition Life Insurance Premiums and Related Investment Income [Abstract] + References No definition available. + Details
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- Definition Amount, after effect of policies assumed or ceded, of expense related to provision for policyholder benefits and costs incurred for variable annuity and variable life insurance contracts. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 + Details
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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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