v3.26.1
Exposures - Total net exposure (Details) - Credit risk - SEK (kr)
kr in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 445,400 kr 426,900
Percentage of net exposures 100.00% 100.00%
Central governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 227,500 kr 216,800
Percentage of net exposures 51.10% 50.80%
Regional governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 11,600 kr 11,400
Percentage of net exposures 2.60% 2.70%
Multilateral development banks    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 2,300 kr 5,100
Percentage of net exposures 0.50% 1.20%
Public sector entity    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 0 kr 0
Percentage of net exposures 0.00% 0.00%
Financial institutions    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 37,200 kr 32,200
Percentage of net exposures 8.40% 7.60%
Corporates    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 166,700 kr 161,300
Percentage of net exposures 37.40% 37.80%
Interest-bearing securities and lending    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 349,500 kr 330,100
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 154,300 kr 140,500
Percentage of net exposures 44.20% 42.50%
Interest-bearing securities and lending | Regional governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 11,100 kr 10,900
Percentage of net exposures 3.20% 3.30%
Interest-bearing securities and lending | Multilateral development banks    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 2,300 kr 5,100
Percentage of net exposures 0.70% 1.60%
Interest-bearing securities and lending | Financial institutions    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 32,000 kr 26,600
Percentage of net exposures 9.20% 8.10%
Interest-bearing securities and lending | Corporates    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 149,700 kr 147,100
Percentage of net exposures 42.80% 44.60%
Committed undisbursed loans, derivatives, etc.    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 96,000 kr 96,800
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 73,200 kr 76,300
Percentage of net exposures 76.30% 78.90%
Committed undisbursed loans, derivatives, etc. | Regional governments    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 600 kr 600
Percentage of net exposures 0.60% 0.60%
Committed undisbursed loans, derivatives, etc. | Financial institutions    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 5,200 kr 5,700
Percentage of net exposures 5.40% 5.80%
Committed undisbursed loans, derivatives, etc. | Corporates    
Disclosure of detailed information about financial instruments [line items]    
Net exposure kr 17,000 kr 14,200
Percentage of net exposures 17.70% 14.70%