Write-Downs of Long-Lived Assets (Long-Lived Assets Classified as Held for Sale) (Detail) - Discontinued Operations, Held-for-sale - Real estate properties and transportation equipment - JPY (¥) ¥ in Millions	Mar. 31, 2020	Mar. 31, 2019
Long Lived Assets Held-for-sale [Line Items]
Investment in operating leases	¥ 5,208	¥ 24,956
Property under facility operations	436	44,473
Other assets	¥ 0	¥ 19