v3.26.1
Commitments, contingencies and guarantees - Maturity information on derivative contracts and standby letters of credit and other guarantees (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Derivative contracts [Member]    
Guarantees [Line Items]    
Carrying value [1],[2] ¥ 9,868,845 ¥ 9,399,725
Maximum potential payout /Notional [1],[2] 649,090,164 609,318,612
Derivative contracts [Member] | Less than 1 year [Member]    
Guarantees [Line Items]    
Maximum potential payout /Notional 172,240,897  
Derivative contracts [Member] | 1 to 3 years [Member]    
Guarantees [Line Items]    
Maximum potential payout /Notional 215,694,397  
Derivative contracts [Member] | 3 to 5 years [Member]    
Guarantees [Line Items]    
Maximum potential payout /Notional 61,022,285  
Derivative contracts [Member] | More than 5 years [Member]    
Guarantees [Line Items]    
Maximum potential payout /Notional 200,132,585  
Standby letters of credit and other guarantees [Member]    
Guarantees [Line Items]    
Carrying value [3] 6  
Maximum potential payout /Notional [3] 5,222,432 ¥ 4,939,056
Standby letters of credit and other guarantees [Member] | Less than 1 year [Member]    
Guarantees [Line Items]    
Maximum potential payout /Notional 5,189,429  
Standby letters of credit and other guarantees [Member] | 1 to 3 years [Member]    
Guarantees [Line Items]    
Maximum potential payout /Notional 18,628  
Standby letters of credit and other guarantees [Member] | 3 to 5 years [Member]    
Guarantees [Line Items]    
Maximum potential payout /Notional 11,126  
Standby letters of credit and other guarantees [Member] | More than 5 years [Member]    
Guarantees [Line Items]    
Maximum potential payout /Notional ¥ 3,249  
[1] Credit derivatives are disclosed in Note 3 “Derivative instruments and hedging activities” and are excluded from above.
[2] Derivative contracts primarily consist of equity, interest rate and foreign exchange contracts.
[3] Primarily related to a certain sponsored repo program where Nomura guarantees to a third party clearing house in relation to its clients’ payment obligations. Our credit exposures under this guarantee is minimized by obtaining collateral from clients at amount approximately the maximum potential payout under the guarantee.