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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Life insurance premiums and related investment income |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | 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 | ¥ (1,590) | ¥ (1,259) | ¥ 15,512 | ¥ (11,820)
Net gains or losses from derivative contracts | (242) | (1) | (1,971) | 252
Life insurance costs |  |  |  |
Changes in the fair value of the policy liabilities and policy account balances | (10,501) | (10,508) | (3,727) | (28,645)
Insurance costs recognized for insurance and annuity payouts as a result of insured events | 7,473 | 8,304 | 13,848 | 16,966
Changes in the fair value of the reinsurance contracts | 206 | 30 | 1,006 | (488)
Variable Annuity and Variable Life Insurance Contracts | Futures |  |  |  |
Life insurance premiums and related investment income |  |  |  |
Net gains or losses from derivative contracts | (150) | 173 | (1,557) | 852
Variable Annuity and Variable Life Insurance Contracts | Foreign exchange contracts |  |  |  |
Life insurance premiums and related investment income |  |  |  |
Net gains or losses from derivative contracts | ¥ (92) | ¥ (174) | ¥ (414) | ¥ (600)

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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//1943274/2147483586/944-220-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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