v3.25.2
Premises and Equipment (Narrative) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Property, Plant and Equipment [Line Items]      
Impairment losses for long-lived assets ¥ 14,695 ¥ 3,159 ¥ 5,318
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Other non-interest expenses (Notes 5 and 26)    
Real estate      
Property, Plant and Equipment [Line Items]      
Impairment of assets held for sale ¥ 363 ¥ 5,468 ¥ 173