v3.26.1
Net Interest Income - Summary of Net Interest Income (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Interest income from:      
Deposits with banks [1] ¥ 781,018 ¥ 652,041 ¥ 604,264
Call loans and bills bought 123,464 183,979 204,232
Reverse repurchase agreements and cash collateral on securities borrowed 580,521 387,823 204,133
Investment securities 665,482 625,735 493,708
Loans and advances 4,778,258 4,867,163 4,438,061
Total interest income 6,928,743 6,716,741 5,944,398
Interest expense from:      
Deposits 2,217,942 2,240,605 2,173,245
Call money and bills sold 39,826 48,064 43,821
Repurchase agreements and cash collateral on securities lent 870,586 873,359 764,578
Borrowings 197,216 209,780 197,065
Debt securities in issue 704,400 738,122 740,769
Premiums for deposit insurance 30,445 29,186 26,333
Others 35,643 63,191 107,824
Total interest expense 4,096,058 4,202,307 4,053,635
Net interest income ¥ 2,832,685 ¥ 2,514,434 ¥ 1,890,763
[1] From the fiscal year ended March 31, 2025, interest income from deposits with the Bank of Japan has been classified as “Interest income from deposits with banks.” Comparative amounts have been reclassified to conform to the current presentation.