v3.26.1
Current and Non-Current Distinction - Summary of Current and Non-Current Distinction (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Assets:    
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
Financial assets at fair value through profit or loss 2,705,113 2,902,969
Investment securities:    
Debt instruments at amortized cost 4,763,716 366,997
Debt instruments at fair value through other comprehensive income 23,268,702 28,008,280
Equity instruments at fair value through other comprehensive income 5,505,439 5,170,856
Loans and advances 130,516,241 125,190,819
Other financial assets 11,876,173 7,061,639
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
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
Not later than one year [member]    
Assets:    
Call loans and bills bought 7,859,702 5,179,876
Reverse repurchase agreements and cash collateral on securities borrowed 25,430,322 22,076,009
Financial assets at fair value through profit or loss 1,931 1,143
Investment securities:    
Debt instruments at amortized cost 64,783 47,746
Debt instruments at fair value through other comprehensive income 7,762,738 13,870,308
Loans and advances 46,404,600 45,487,002
Other financial assets 11,583,734 6,938,327
Liabilities:    
Deposits 196,919,463 184,778,247
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
Financial liabilities designated at fair value through profit or loss 76,780 43,698
Borrowings 4,913,681 4,664,053
Debt securities in issue 6,354,558 5,226,279
Other financial liabilities 16,415,268 10,336,163
More than twelve months [Member]    
Assets:    
Call loans and bills bought 25,355 20,913
Reverse repurchase agreements and cash collateral on securities borrowed 38,420  
Financial assets at fair value through profit or loss 2,703,182 2,901,826
Investment securities:    
Debt instruments at amortized cost 4,698,933 319,251
Debt instruments at fair value through other comprehensive income 15,505,964 14,137,972
Equity instruments at fair value through other comprehensive income 5,505,439 5,170,856
Loans and advances 84,111,641 79,703,817
Other financial assets 292,439 123,312
Liabilities:    
Deposits 5,010,964 5,244,495
Financial liabilities designated at fair value through profit or loss 584,644 554,148
Borrowings 5,637,976 8,033,646
Debt securities in issue 10,221,865 9,161,136
Other financial liabilities ¥ 9,752 ¥ 10,771