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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, 2023 | Mar. 31, 2022 | Mar. 31, 2021
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 | ¥ (2,312) | ¥ 8,501 | ¥ 76,470
Net gains or losses from derivative contracts | (1,360) | (1,520) | (10,271)
Life insurance costs |  |  |
Changes in the fair value of the policy liabilities and policy account balances | (35,097) | (67,984) | (35,565)
Insurance costs recognized for insurance and annuity payouts as a result of insured events | 28,754 | 69,727 | 77,631
Changes in the fair value of the reinsurance contracts | 538 | 1,083 | 11,909
Variable Annuity and Variable Life Insurance Contracts | Futures |  |  |
Life insurance premiums and related investment income |  |  |
Net gains or losses from derivative contracts | (855) | (1,075) | (9,412)
Variable Annuity and Variable Life Insurance Contracts | Foreign exchange contracts |  |  |
Life insurance premiums and related investment income |  |  |
Net gains or losses from derivative contracts | (505) | (445) | (261)
Variable Annuity and Variable Life Insurance Contracts | Options held |  |  |
Life insurance premiums and related investment income |  |  |
Net gains or losses from derivative contracts | ¥ 0 | ¥ 0 | ¥ (598)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714 + Details
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