v3.26.1
Related-Party Transactions - Transactions with Associates, Joint Ventures and Other Entities (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Assets:      
Loans and advances ¥ 130,516,241 ¥ 125,190,819  
Others 13,065,937 7,983,972  
Liabilities:      
Deposits 201,930,427 190,022,742  
Others 16,767,384 10,821,441  
Income statements:      
Expense (interest expense and others) [1] 3,026,892 2,917,319 ¥ 2,690,719
Associates, joint ventures, and other entities [Member]      
Assets:      
Loans and advances 2,586,503 2,087,961  
Others 31,800 136,162  
Liabilities:      
Deposits 552,285 325,665  
Others 54,358 74,475  
Income statements:      
Income (interest income, fee and commission income, and others) 102,228 97,311 101,016
Expense (interest expense and others) ¥ 49,497 ¥ 94,521 ¥ 59,968
[1] From the fiscal year ended March 31, 2025, the Group has presented “Net gains (losses) arising from derecognition of financial assets at amortized cost” as a separate line item in the consolidated income statements. This line item was not presented separately prior to the fiscal year ended March 31, 2025, but was included within “Other income” and “Other expenses.” The comparative amounts have been restated to conform to the current presentation.