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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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Policy holder account balance fixed annuity and annutization benefits.

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Policy holder account balance for variable annuity and variable life insurance contracts and market benefits.

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Policyholder account for single-payment whole life insurance.

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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.

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Amount, after effect of reinsurance, of liability for future policy benefit.

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Amount due to policyholders for funds held that are returnable under the terms of insurance contracts, classified as other.

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