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Derivative Financial Instruments (Summary of Notional and Fair Value Amounts of Derivative Instruments Outstanding) (Detail) - JPY (¥)
¥ in Billions
Mar. 31, 2020
Mar. 31, 2019
Derivatives, Fair Value [Line Items]    
Notional amount [1] ¥ 1,320,665 ¥ 1,227,208
Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Notional amount [1] 1,123,546 1,052,267
Foreign exchange contracts    
Derivatives, Fair Value [Line Items]    
Notional amount [1] 185,359 166,383
Equity-related contracts    
Derivatives, Fair Value [Line Items]    
Notional amount [1] 6,684 5,181
Credit-related contracts    
Derivatives, Fair Value [Line Items]    
Notional amount [1] 4,676 2,939
Other contracts    
Derivatives, Fair Value [Line Items]    
Notional amount [1] 400 438
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair value of derivative receivables [2] 10,536 7,904
Fair value of derivative payables [2] 10,021 7,541
Not Designated as Hedging Instrument | Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Fair value of derivative receivables [2] 7,232 5,786
Fair value of derivative payables [2] 6,788 5,610
Not Designated as Hedging Instrument | Foreign exchange contracts    
Derivatives, Fair Value [Line Items]    
Fair value of derivative receivables [2] 2,926 1,959
Fair value of derivative payables [2] 2,899 1,758
Not Designated as Hedging Instrument | Equity-related contracts    
Derivatives, Fair Value [Line Items]    
Fair value of derivative receivables [2] 310 125
Fair value of derivative payables [2] 266 142
Not Designated as Hedging Instrument | Credit-related contracts    
Derivatives, Fair Value [Line Items]    
Fair value of derivative receivables [2] 30 18
Fair value of derivative payables [2] 29 17
Not Designated as Hedging Instrument | Other contracts    
Derivatives, Fair Value [Line Items]    
Fair value of derivative receivables [2] 38 16
Fair value of derivative payables [2] ¥ 39 ¥ 14
[1] Notional amount includes the sum of gross long and gross short third-party contracts.
[2] Derivative receivables and payables are recorded in Trading account assets and Trading account liabilities, respectively.