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Write-Downs of Long-Lived Assets - Long-Lived Assets and Liabilities Associated With Those Assets Classified as Held for Sale (Detail) - Discontinued Operations, Held-for-sale - Real estate properties and transportation equipment - JPY (¥) ¥ in Millions	Mar. 31, 2025	Mar. 31, 2024
Long Lived Assets Held-for-sale [Line Items]
Investment in operating leases	¥ 7,230	¥ 43,775
Property under facility operations	15,217	8,405
Office facilities	3,558	82
Other assets	22	6,005
Other liabilities	¥ 221	¥ 68

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