v3.25.4
Risk information - Market risk (Details)
kr in Millions
 12 Months Ended
Dec. 31, 2025
SEK (kr)
Dec. 31, 2024
SEK (kr)
NII risk together with risk to NII from cross-currency basis spreads    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Market risk amount kr 356 kr 398
Interest rate risk regarding changes in future net interest income (NII)    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk change (in basis points) 0.0100  
Risk to NII from cross currency basis spreads    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk change (in basis points) 0.0020  
VAR    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
VAR horizon period (in years) 2 years  
sVaR    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Market risk amount kr 71 kr 58
VAR horizon period (in years) 1 year  
Confidence level for VAR calculation 99.00%  
Interest rate risk regarding changes in the economic value of SEK's portfolio (EVE)    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk change (in basis points) 0.0100  
Credit spread risk in assets    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk change (in basis points) 0.0100  
Credit spread risk in own debt    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk change (in basis points) 0.0020  
Cross currency basis spread risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk change (in basis points) 0.0020  
FX    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Assumed change in all foreign currency positions 10.00%  
Tenor basis spread risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk change (in basis points) 0.0010  
Tenor basis spread risk | Minimum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Lending and borrowing which is not swapped to three month tenor (in months) 1 month  
Tenor basis spread risk | Maximum    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Lending and borrowing which is not swapped to three month tenor (in months) 6 months