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Derivative instruments and hedging activities - Additional information (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2022
Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative liability position with credit-risk-related contingent features ¥ 718,000 ¥ 638,000
Collateral pledged for derivative instruments with credit-risk-related contingent features that are in a liability position 553,000 421,000
Additional collateral required to be posted, aggregate fair value 29,000 1,000
Gross liability balance of total return swaps in respect of financial assets derecognized [1] 31,074,000 17,739,000
Sale and Total Return Swap [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Transfer of financial assets accounted for sale amount derecognized 69,405 69,405
Cash proceeds received from derecognition of financial assets amount 69,535 69,535
Transfer of financial assets accounted for sale fair value of derecognized assets 58,087 63,994
Gross liability balance of total return swaps in respect of financial assets derecognized ¥ 11,230 ¥ 5,319
[1] Includes the amount of embedded derivatives bifurcated in accordance with ASC 815.