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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Minimum Guaranteed Interest Rates (Parenthetical) (Detail) - Fixed Annuity	Mar. 31, 2025	Mar. 31, 2024
Minimum | 0.00% – less than 1.50%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance guaranteed minimum credit rating	0.00%	0.00%
Minimum | 1.50% or more
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance guaranteed minimum credit rating	1.50%	1.50%
Maximum | 0.00% – less than 1.50%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance guaranteed minimum credit rating	1.50%	1.50%

X

- Definition

Guaranteed minimum crediting rate on policyholder account balance.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29F
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 7A
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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
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29F
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F

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