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Leases - Lessee: Supplemental Balance Sheet Information (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2023
Mar. 31, 2022
Operating And Finance Lease Supplemental Balance Sheet Information [Line Items]    
Right-of-use asset (operating leases) ¥ 279,415 ¥ 275,093
Operating lease, Other Liabilities 280,829 275,199
Operating lease, Total lease liabilities ¥ 280,829 ¥ 275,199
Operating lease, Weighted average remaining lease term 11 years 11 years
Operating lease, Weighted average discount rate 1.30% 1.10%
Right-of-use asset (finance leases) ¥ 6,544 ¥ 7,093
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Net Investment in Lease, before Allowance for Credit Loss Net Investment in Lease, before Allowance for Credit Loss
Finance leases, Other Liability ¥ 7,129 ¥ 7,698
Finance leases, Total lease liabilities ¥ 7,129 ¥ 7,698
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Liabilities Liabilities
Finance leases, Weighted average remaining lease term 37 years 25 years
Finance leases, Weighted average discount rate 2.40% 2.50%
Operating Lease, Liability, Statement of Financial Position [Extensible List] Liabilities Liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Investment in Operating Leases    
Operating And Finance Lease Supplemental Balance Sheet Information [Line Items]    
Right-of-use asset (operating leases) ¥ 93,635 ¥ 102,787
Right-of-use asset (finance leases) 4,782 4,955
Property under Facility Operations    
Operating And Finance Lease Supplemental Balance Sheet Information [Line Items]    
Right-of-use asset (operating leases) 85,036 68,149
Right-of-use asset (finance leases) 1,394 1,763
Office Facilities    
Operating And Finance Lease Supplemental Balance Sheet Information [Line Items]    
Right-of-use asset (operating leases) 100,744 104,157
Right-of-use asset (finance leases) ¥ 368 ¥ 375