v3.26.1
Derivative instruments and hedging activities - Additional information (Detail) - JPY (¥)
¥ in Billions
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative liability position with credit-risk-related contingent features ¥ 859 ¥ 770
Collateral pledged for derivative instruments with credit-risk-related contingent features that are in a liability position 653 628
Additional collateral required to be posted, aggregate fair value ¥ 9 ¥ 8