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Derivative instruments and hedging activities - Additional information (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2021
Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative liability position with credit-risk-related contingent features ¥ 430,000 ¥ 727,000
Collateral pledged for derivative instruments with credit-risk-related contingent features that are in a liability position 298,000 583,000
Additional collateral required to be posted, aggregate fair value 2,000 2,000
Gross liability balance of total return swaps in respect of financial assets derecognized [1] 13,264,000 16,191,000
Sale and Total Return Swap [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Transfer of financial assets accounted for sale amount derecognized 69,737 69,405
Cash proceeds received from derecognition of financial assets amount 69,868 69,535
Transfer of financial assets accounted for sale fair value of derecognized assets 68,423 67,773
Gross liability balance of total return swaps in respect of financial assets derecognized ¥ 1,214 ¥ 1,539
[1] Includes the amount of embedded derivatives bifurcated in accordance with ASC 815.