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Derivative Financial Instruments and Hedging (Derivative instruments fair value hedge assets and liabilities) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2025	Mar. 31, 2024
Investment in Securities
Carrying amount	¥ 491,447	¥ 489,908
The cumulative amount of fair value hedging adjustments included in the carrying amount	0	(1,088)
Carrying amount	28,220
The cumulative amount of fair value hedging adjustments included in the carrying amount	¥ 0
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Investment in Securities	Investment in Securities
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense	Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense
Installment Loans
Carrying amount	¥ 22,451	¥ 15,882
The cumulative amount of fair value hedging adjustments included in the carrying amount	(92)	0
Carrying amount
The cumulative amount of fair value hedging adjustments included in the carrying amount
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Investment in Securities	Investment in Securities
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense	Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense

X

- Definition

Amount of asset hedged in fair value hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE

+ Details

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Balance Type:	debit
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X

- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
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-Section 50
-Paragraph 4EE
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE

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X

- Definition

Indicates line item in statement of financial position that includes hedged asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE

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-Paragraph 181
-Publisher FASB
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- Definition

Amount of liability hedged in fair value hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE

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X

- Definition

Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
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- Definition

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+ References

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-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
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-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE

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