v3.25.4
Risk information - Total net exposures (Details) - Credit risk - SEK (kr)
kr in Billions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 426.9 kr 420.5
Percentage of net exposures 100.00% 100.00%
Central governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 216.8 kr 197.6
Percentage of net exposures 50.80% 47.00%
Regional governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 11.4 kr 18.7
Percentage of net exposures 2.70% 4.50%
Multilateral development banks    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 5.1 kr 7.0
Percentage of net exposures 1.20% 1.70%
Public sector entity    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 0.0 kr 1.0
Percentage of net exposures 0.00% 0.20%
Financial institutions    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 32.2 kr 34.1
Percentage of net exposures 7.50% 8.10%
Corporates    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 161.3 kr 162.1
Percentage of net exposures 37.80% 38.50%
Equity exposures    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 0.0 kr 0.0
Percentage of net exposures   0.00%
Interest-bearing securities and lending    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 330.1 kr 348.2
Percentage of net exposures 100.00% 100.00%
Interest-bearing securities and lending | Central governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 140.5 kr 148.3
Percentage of net exposures 42.50% 42.60%
Interest-bearing securities and lending | Regional governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 10.9 kr 18.2
Percentage of net exposures 3.30% 5.30%
Interest-bearing securities and lending | Multilateral development banks    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 5.1 kr 7.0
Percentage of net exposures 1.60% 2.00%
Interest-bearing securities and lending | Public sector entity    
Disclosure of detailed information about financial instruments [line items]    
Net exposure   kr 1.0
Percentage of net exposures   0.30%
Interest-bearing securities and lending | Financial institutions    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 26.6 kr 28.0
Percentage of net exposures 8.10% 8.00%
Interest-bearing securities and lending | Corporates    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 147.1 kr 145.7
Percentage of net exposures 44.60% 41.80%
Interest-bearing securities and lending | Equity exposures    
Disclosure of detailed information about financial instruments [line items]    
Net exposure   kr 0.0
Percentage of net exposures   0.00%
Committed undisbursed loans, derivatives, etc.    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 96.8 kr 72.3
Percentage of net exposures 100.00% 100.00%
Committed undisbursed loans, derivatives, etc. | Central governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 76.3 kr 49.3
Percentage of net exposures 78.80% 68.20%
Committed undisbursed loans, derivatives, etc. | Regional governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 0.6 kr 0.5
Percentage of net exposures 0.60% 0.70%
Committed undisbursed loans, derivatives, etc. | Financial institutions    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 5.7 kr 6.1
Percentage of net exposures 5.90% 8.40%
Committed undisbursed loans, derivatives, etc. | Corporates    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 14.2 kr 16.4
Percentage of net exposures 14.70% 22.70%