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Derivative instruments and hedging activities - Offsetting of derivatives and related collateral amounts (Parenthetical) (Detail) - JPY (¥)
¥ in Billions
Sep. 30, 2020
Mar. 31, 2020
Derivative Instruments and Hedging Activities [Abstract]    
Gross balances of derivative assets, not subject to enforceable master netting arrangements or similar agreements ¥ 443 ¥ 1,013
Gross balances of derivative liabilities, not subject to enforceable master netting arrangements or similar agreements 572 1,046
Cash collateral receivables against net derivative liabilities 1,592 1,679
Cash collateral payables against net derivative assets 1,726 1,940
Cash collateral receivables, not being offset against net derivatives 182 374
Cash collateral payables, not being offset against net derivatives ¥ 446 ¥ 540