v3.25.2
Goodwill and Other Intangible Assets (Carrying Amount of Other Intangible Assets by Major Class) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Intangible assets subject to amortization:    
Gross carrying amount ¥ 4,974,424 ¥ 4,587,757
Accumulated amortization 3,580,136 3,298,175
Net carrying amount 1,394,288 1,289,582
Intangible assets not subject to amortization:    
Other 8,227 8,178
Total 1,402,515 1,297,760
Software    
Intangible assets subject to amortization:    
Gross carrying amount 4,093,320 3,793,187
Accumulated amortization 3,081,494 2,865,294
Net carrying amount 1,011,826 927,893
Customer relationships    
Intangible assets subject to amortization:    
Gross carrying amount 632,016 556,183
Accumulated amortization 335,898 291,101
Net carrying amount 296,118 265,082
Core deposit intangibles    
Intangible assets subject to amortization:    
Gross carrying amount 138,203 130,276
Accumulated amortization 102,052 86,535
Net carrying amount 36,151 43,741
Trade names    
Intangible assets subject to amortization:    
Gross carrying amount 87,183 84,758
Accumulated amortization 50,871 46,137
Net carrying amount 36,312 38,621
Other    
Intangible assets subject to amortization:    
Gross carrying amount 23,702 23,353
Accumulated amortization 9,821 9,108
Net carrying amount ¥ 13,881 ¥ 14,245