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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) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Life insurance premiums and related investment income |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized Gains Loss On Derivative Instruments | Unrealized Gains Loss On Derivative Instruments | Unrealized Gains Loss On Derivative Instruments
Variable Annuity and Variable Life Insurance Contracts |  |  |
Life insurance premiums and related investment income |  |  |
Net realized and unrealized gains or losses from investment assets | ¥ (3,496) | ¥ 40,821 | ¥ (2,312)
Net gains or losses from derivative contracts | (372) | (3,568) | (1,360)
Life insurance costs |  |  |
Changes in the fair value of the policy liabilities and policy account balances | (30,998) | 3,208 | (35,097)
Insurance costs recognized for insurance and annuity payouts as a result of insured events | 23,706 | 26,997 | 28,754
Changes in the fair value of the reinsurance contracts | 200 | 1,890 | 538
Variable Annuity and Variable Life Insurance Contracts | Futures |  |  |
Life insurance premiums and related investment income |  |  |
Net gains or losses from derivative contracts | (262) | (3,046) | (855)
Variable Annuity and Variable Life Insurance Contracts | Foreign exchange contracts |  |  |
Life insurance premiums and related investment income |  |  |
Net gains or losses from derivative contracts | ¥ (110) | ¥ (522) | ¥ (505)

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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 + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + 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 + 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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