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Leases - Lessee: Supplemental Balance Sheet Information (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2024
Mar. 31, 2023
Operating And Finance Lease Supplemental Balance Sheet Information [Line Items]    
Right-of-use asset (operating leases) ¥ 249,890 ¥ 279,415
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Operating lease, Other Liabilities ¥ 252,344 ¥ 280,829
Operating lease, Total lease liabilities ¥ 252,344 ¥ 280,829
Operating Lease, Liability, Statement of Financial Position [Extensible List] Liabilities Liabilities
Operating lease, Weighted average remaining lease term 11 years 11 years
Operating lease, Weighted average discount rate 1.70% 1.30%
Right-of-use asset (finance leases) ¥ 7,284 ¥ 6,544
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 Liabilities ¥ 7,877 ¥ 7,129
Finance leases, Total lease liabilities ¥ 7,877 ¥ 7,129
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Liabilities Liabilities
Finance leases, Weighted average remaining lease term 35 years 37 years
Finance leases, Weighted average discount rate 2.20% 2.40%
Investment in Operating Leases    
Operating And Finance Lease Supplemental Balance Sheet Information [Line Items]    
Right-of-use asset (operating leases) ¥ 82,674 ¥ 93,635
Right-of-use asset (finance leases) 4,685 4,782
Property under Facility Operations    
Operating And Finance Lease Supplemental Balance Sheet Information [Line Items]    
Right-of-use asset (operating leases) 72,284 85,036
Right-of-use asset (finance leases) 2,306 1,394
Office Facilities    
Operating And Finance Lease Supplemental Balance Sheet Information [Line Items]    
Right-of-use asset (operating leases) 94,932 100,744
Right-of-use asset (finance leases) ¥ 293 ¥ 368