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Derivative instruments and hedging activities - Offsetting of derivatives and related collateral amounts (Parenthetical) (Detail) - JPY (¥)
¥ in Billions
Sep. 30, 2022
Mar. 31, 2022
Derivative Instruments and Hedging Activities [Abstract]    
Gross balances of derivative assets, not subject to enforceable master netting arrangements or similar agreements ¥ 765 ¥ 458
Gross balances of derivative liabilities, not subject to enforceable master netting arrangements or similar agreements 936 671
Cash collateral receivables against net derivative liabilities 2,026 1,431
Cash collateral payables against net derivative assets 2,917 1,960
Cash collateral receivables, not being offset against net derivatives 438 359
Cash collateral payables, not being offset against net derivatives ¥ 712 ¥ 652