v3.26.1
Affiliated companies and other equity-method investees - Summary of financial information for significant affiliated companies and other equity-method investees (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Subsidiary or Equity Method Investee [Line Items]      
Total assets ¥ 62,645,925 ¥ 56,802,170  
Total liabilities 58,791,010 53,221,171  
Net revenues 4,758,486 4,736,743 ¥ 4,157,294
Non-interest expenses [1] 1,627,892 1,420,521 1,288,150
Net income attributable to affiliated companies 362,129 340,736 165,863
Significant affiliated companies [Member]      
Subsidiary or Equity Method Investee [Line Items]      
Total assets 4,070,274 3,849,351  
Total liabilities 2,761,101 2,597,957  
Net revenues 1,503,892 1,254,864 1,187,696
Non-interest expenses 1,242,921 965,914 937,551
Net income attributable to affiliated companies ¥ 171,418 ¥ 209,174 ¥ 176,705
[1] Includes primarily personnel expenses, occupancy, technology, and professional fees.