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Lease Income (Parenthetical) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Lessor, Lease, Description [Line Items]
Gain (loss) on sale of leased assets, net, operating leases	¥ 76,633	¥ 53,441	¥ 56,932
Real estate asset [member]
Lessor, Lease, Description [Line Items]
Gain (loss) on sale of leased assets, net, operating leases	31,965	20,960	25,699
Operating lease assets other than real estate [member]
Lessor, Lease, Description [Line Items]
Gain (loss) on sale of leased assets, net, operating leases	¥ 44,668	¥ 32,481	¥ 31,233

X

- Definition

The net gain (loss) arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 30
-Name Accounting Standards Codification
-Section 40
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481222/840-30-40-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 40
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482161/360-10-40-3A

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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/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

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