Lease Transactions (Component of Sales Type and Direct Financing Lease Transactions) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2022
Mar. 31, 2021
Leases [Abstract]    
Lease receivables (undiscounted) ¥ 1,855,125 ¥ 1,913,852
Adjustments:    
Discounted unguaranteed residual value 12,439 15,435
Initial direct cost on sales type and direct financing leases 27,695 27,869
Deferred selling profit (306,316) (313,784)
Net investment in sales type and direct financing leases ¥ 1,588,943 ¥ 1,643,372