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Leases - Lessor: Net Investment in Leases (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Net Investment in Leases [Line Items] |  |
Reduction in lease receivables | ¥ 32,357 | ¥ 31,108
Maximum [Member] |  |
Net Investment in Leases [Line Items] |  |
Lessee operating lease term of contract | 13 years | 14 years

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- Definition The increase (decrease) during the reporting period in the amount due from lessees arising from lease agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-3 + Details
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