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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, 2024	Mar. 31, 2023	Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Subtotal	¥ 1,430,462	¥ 1,331,671	¥ 1,308,456
Policy account balances for variable annuity and variable life insurance contracts and market risk benefits	167,207	163,734	198,905
Fixed annuities and annuitization benefits	138,419	158,952	193,322
Others	156,422	177,700	212,015
Total	1,892,510	1,832,057	1,912,698
Yen-denominated insurance (First Sector)
Liability for Future Policy Benefit, Activity [Line Items]
Subtotal	739,696	712,904	690,321
Yen-denominated insurance (Third Sector)
Liability for Future Policy Benefit, Activity [Line Items]
Subtotal	606,419	591,067	595,851
Foreign currency denominated insurance
Liability for Future Policy Benefit, Activity [Line Items]
Subtotal	¥ 84,347	¥ 27,700	¥ 22,284

X

- Definition

Policy holder account balance fixed annuity and annutization benefits.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- 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

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 805
-Section 55
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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-Topic 944
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- Definition

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

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- Definition

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

+ References

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-Topic 944
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