v3.26.1
Summary of Noninterest Income (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]      
Fee and commission income ¥ 1,375,976 ¥ 1,206,839 ¥ 1,117,826
Foreign exchange gains (losses)—net [1] (40,536) (185,963) (19,390)
Trading account gains (losses)—net [2] 102,749 803,383 390,260
Investment gains (losses)—net:      
Debt securities [3] (74,307) (4,538) (6,446)
Equity securities [3] 1,035,589 (181,948) 1,010,288
Equity in earnings (losses) of equity method investees—net [3] 75,152 28,233 19,791
Gains on disposal of premises and equipment 17,372 71,862 10,128
Other noninterest income [2],[4] 326,113 265,045 221,273
Total noninterest income 2,818,108 2,002,912 2,743,729
Premises and Equipment      
Investment gains (losses)—net:      
Gains on disposal of premises and equipment [3] 17,372 71,862 10,128
Foreign Exchange      
Disaggregation of Revenue [Line Items]      
Foreign exchange gains (losses)—net [3] (40,536) (185,963) (19,390)
Securities-related business      
Disaggregation of Revenue [Line Items]      
Fee and commission income [5] 306,811 262,916 246,865
Deposits-related business      
Disaggregation of Revenue [Line Items]      
Fee and commission income [5] 15,446 16,018 15,591
Lending-related business      
Disaggregation of Revenue [Line Items]      
Fee and commission income [2],[6] 299,353 252,267 232,626
Remittance business      
Disaggregation of Revenue [Line Items]      
Fee and commission income [5] 105,124 102,349 106,762
Asset management business      
Disaggregation of Revenue [Line Items]      
Fee and commission income [5] 136,475 126,684 115,504
Trust-related business      
Disaggregation of Revenue [Line Items]      
Fee and commission income [5] 169,243 145,298 136,800
Agency business      
Disaggregation of Revenue [Line Items]      
Fee and commission income [5] 40,727 40,663 38,329
Guarantee-related business      
Disaggregation of Revenue [Line Items]      
Fee and commission income [3] 50,742 46,629 43,791
Fees for other customer services      
Disaggregation of Revenue [Line Items]      
Fee and commission income [5] ¥ 252,054 ¥ 214,016 ¥ 181,558
[1] Amounts include realized and unrealized gains and losses on both derivative instruments and nonderivative instruments. Amounts on derivative instruments include gains and losses on forward foreign exchange contracts and currency options. Amounts on nonderivative instruments include translation gains and losses related to foreign currency-denominated debt securities reported as Trading securities.
[2] Part of these amounts are considered to be revenues from contracts that are within the scope of ASC 606.
[3] These amounts are revenues from contracts that do not meet the scope of ASC 606.
[4] These amounts include the net unrealized gains resulting from changes in fair values of structured notes that contain embedded derivatives. See Note 26 “Fair value” for further details.
[5] These amounts are revenues from contracts within the scope of ASC 606, “Revenue from contracts with customers” (“ASC 606”).
[6] Most of the lending-related fees such as commitment fees and arrangement fees are not within the scope of ASC 606.