v3.26.1
Analysis of Financial Assets and Liabilities by Measurement Basis - Carrying Amounts of Financial Assets and Liabilities by Category and Line Item (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Financial assets:      
Cash and deposits with banks ¥ 74,362,135 ¥ 76,669,401 ¥ 78,750,443
Call loans and bills bought 7,885,057 5,200,789  
Reverse repurchase agreements and cash collateral on securities borrowed 25,468,742 22,076,009  
Trading assets 6,890,217 6,176,613  
Derivative financial instruments 10,093,100 8,313,016  
Financial assets at fair value through profit or loss 2,705,113 2,902,969  
Investment securities 33,537,857 33,546,133  
Loans and advances 130,516,241 125,190,819  
Other financial assets 11,876,173 7,061,639  
Total 303,334,635 287,137,388  
Financial liabilities:      
Deposits 201,930,427 190,022,742  
Call money and bills sold 3,656,737 4,378,277  
Repurchase agreements and cash collateral on securities lent 24,176,556 27,791,101  
Trading liabilities 4,130,591 4,838,439  
Derivative financial instruments 11,472,444 9,303,258  
Financial liabilities designated at fair value through profit or loss 661,424 597,846  
Borrowings 10,551,657 12,697,699  
Debt securities in issue 16,576,423 14,387,415  
Other financial liabilities 16,425,020 10,346,934  
Total 289,581,279 274,363,711  
Financial Assets and Liabilities at fair value through profit or loss [member]      
Financial assets:      
Trading assets 6,890,217 6,176,613  
Derivative financial instruments 10,093,100 8,313,016  
Financial assets at fair value through profit or loss 2,705,113 2,902,969  
Total 19,688,430 17,392,598  
Financial liabilities:      
Deposits (41,458) (20,858)  
Trading liabilities 4,130,591 4,838,439  
Derivative financial instruments 11,472,444 9,303,258  
Financial liabilities designated at fair value through profit or loss 661,424 597,846  
Borrowings (3,361) (1,967)  
Debt securities in issue (6,751) (2,495)  
Total 16,212,889 14,714,223  
Financial Assets and Liabilities at Amortized Cost [member]      
Financial assets:      
Cash and deposits with banks 74,362,135 76,669,401  
Call loans and bills bought 7,885,057 5,200,789  
Reverse repurchase agreements and cash collateral on securities borrowed 25,468,742 22,076,009  
Investment securities 4,763,716 366,997  
Loans and advances 130,516,241 125,190,819  
Other financial assets 11,876,173 7,061,639  
Total 254,872,064 236,565,654  
Financial liabilities:      
Deposits 201,971,885 190,043,600  
Call money and bills sold 3,656,737 4,378,277  
Repurchase agreements and cash collateral on securities lent 24,176,556 27,791,101  
Borrowings 10,555,018 12,699,666  
Debt securities in issue 16,583,174 14,389,910  
Other financial liabilities 16,425,020 10,346,934  
Total 273,368,390 259,649,488  
Debt instruments at fair value through other comprehensive income [member]      
Financial assets:      
Investment securities 23,268,702 28,008,280  
Total 23,268,702 28,008,280  
Equity instruments at fair value through other comprehensive income [member]      
Financial assets:      
Investment securities 5,505,439 5,170,856  
Total ¥ 5,505,439 ¥ 5,170,856