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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	Sep. 30, 2023	Mar. 31, 2023	Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Subtotal	¥ 1,304,059	¥ 1,331,671	¥ 1,308,456
Policy account balances for variable annuity and variable life insurance contracts and market risk benefits	160,177	163,734	198,905
Fixed annuities and annuitization benefits	149,544	158,952	193,322
Others	169,294	177,700	212,015
Total	1,783,074	1,832,057	1,912,698
Yen-denominated insurance (First Sector)
Liability for Future Policy Benefit, Activity [Line Items]
Subtotal	695,197	712,904	690,321
Yen-denominated insurance (Third Sector)
Liability for Future Policy Benefit, Activity [Line Items]
Subtotal	577,384	591,067	595,851
Foreign currency denominated insurance
Liability for Future Policy Benefit, Activity [Line Items]
Subtotal	¥ 31,478	¥ 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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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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X

- Definition

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

+ References

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-Topic 944
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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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