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Severance Indemnities and Pension Plans (Amounts Recognized in Accumulated OCI) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2024
Mar. 31, 2023
Domestic, Japan | Pension benefits and SIPs    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) ¥ (538,886) ¥ 32,257
Prior service cost 525 (1,449)
Gross amount recognized in Accumulated OCI (538,361) 30,808
Taxes 121,569 (52,367)
Net amount recognized in Accumulated OCI (416,792) (21,559)
Foreign offices and subsidiaries | Pension benefits    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 38,090 21,347
Prior service cost (1,652) (1,747)
Gross amount recognized in Accumulated OCI 36,438 19,600
Taxes (10,946) (6,135)
Net amount recognized in Accumulated OCI 25,492 13,465
Foreign offices and subsidiaries | Other benefits    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 2,105 2,729
Prior service cost (1,114) (1,375)
Gross amount recognized in Accumulated OCI 991 1,354
Taxes (306) (736)
Net amount recognized in Accumulated OCI ¥ 685 ¥ 618