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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Policy Liabilities And Policy Account Balances In Statement of Financial Position (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Subtotal |  | ¥ 1,424,312 | ¥ 1,430,462
Policy account balances for single-payment whole life insurance |  | 134,572 | 0
Fixed annuities and annuitization benefits |  | 119,093 | 138,419
Policy account balances for variable annuity and variable life insurance contracts and market risk benefits |  | 136,257 | 167,207
Others | [1] | 133,813 | 156,422
Total |  | 1,948,047 | 1,892,510
Yen-denominated insurance (First Sector) |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Subtotal |  | 717,257 | 739,696
Yen-denominated insurance (Third Sector) |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Subtotal |  | 572,708 | 606,419
Foreign currency denominated insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Subtotal |  | ¥ 134,347 | ¥ 84,347
[1] | Others include unearned premiums and liabilities for unpaid claims.

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- Definition The liability as of the balance sheet date for future benefits to be paid to or on behalf of policyholders and expenses, less the present value of future net premiums payable under the insurance contracts and the policy cash accumulations, for the segregated group of participating or dividend-paying policies and contracts identified as a closed block. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477301/944-805-55-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 805 -Section 50 -Paragraph 3 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478072/944-805-50-3 + Details
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