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Severance Indemnities and Pension Plans (Estimated Future Benefit Payments) (Detail)
¥ in Millions
Mar. 31, 2024
JPY (¥)
Domestic, Japan | Pension benefits and SIPs  
Defined Benefit Plan Disclosure [Line Items]  
2025 ¥ 80,546
2026 78,019
2027 77,061
2028 77,552
2029 77,086
Thereafter (2030-2034) 364,282
Foreign offices and subsidiaries | Pension benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 11,604
2026 11,835
2027 14,068
2028 14,628
2029 15,086
Thereafter (2030-2034) 112,240
Foreign offices and subsidiaries | Other benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 2,581
2026 2,462
2027 2,338
2028 2,187
2029 2,051
Thereafter (2030-2034) ¥ 8,844