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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Minimum Guaranteed Interest Rates (Detail) - Fixed Annuity - JPY (¥) ¥ in Millions	Sep. 30, 2025	Mar. 31, 2025
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	¥ 110,259	¥ 119,093
50-150bp
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	15,861	7,421
150bp and above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	222,476	127,151
0.00% – less than 1.50%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	102,794	111,626
0.00% – less than 1.50% | 50-150bp
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	15,861	7,421
0.00% – less than 1.50% | 150bp and above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	222,476	127,151
1.50% or more
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	7,465	7,467
1.50% or more | 50-150bp
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	0	0
1.50% or more | 150bp and above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policy holder funds	¥ 0	¥ 0

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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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-Topic 944
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-Section 50
-Paragraph 7A
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-Publisher FASB
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- Definition

Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (c)
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-URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A

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