v3.25.2
Severance Indemnities and Pension Plans (Estimated Future Benefit Payments) (Detail)
¥ in Millions
Mar. 31, 2025
JPY (¥)
Domestic, Japan | Pension benefits and SIPs  
Defined Benefit Plan Disclosure [Line Items]  
2026 ¥ 82,594
2027 78,928
2028 79,260
2029 78,574
2030 77,371
Thereafter (2031-2035) 363,606
Foreign offices and subsidiaries | Pension benefits  
Defined Benefit Plan Disclosure [Line Items]  
2026 12,170
2027 13,770
2028 14,523
2029 14,661
2030 15,747
Thereafter (2031-2035) 106,242
Foreign offices and subsidiaries | Other benefits  
Defined Benefit Plan Disclosure [Line Items]  
2026 2,452
2027 2,327
2028 2,169
2029 2,014
2030 1,856
Thereafter (2031-2035) ¥ 8,070