v3.25.4
Impairments - Schedule of impairment (Details) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Established credit losses kr (100) kr (404)  
Reserves applied to cover established credit losses 94 393  
Recovered credit losses 1 4 kr 4
Net credit losses (429) (93) (585)
Loans in the form of interest-bearing securities      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Established credit losses   (113)  
Reserves applied to cover established credit losses   113  
Net credit losses (1) 164 (256)
Loans to credit institutions      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses 0 2 1
Loans to the public      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Established credit losses (100) (288)  
Reserves applied to cover established credit losses 94 280  
Recovered credit losses 1 4 4
Net credit losses (429) (295) (304)
Off-balance      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Established credit losses 0 (3)  
Net credit losses 1 36 (26)
Expected credit losses, stage 1      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses (19) 116 (36)
Expected credit losses, stage 1 | Loans in the form of interest-bearing securities      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses 0 17 1
Expected credit losses, stage 1 | Loans to credit institutions      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses 0 2 1
Expected credit losses, stage 1 | Loans to the public      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses (19) 83 (34)
Expected credit losses, stage 1 | Off-balance      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses 1 14 (4)
Lifetime expected credit losses | Expected credit losses, stage 2      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses (293) (24) (40)
Lifetime expected credit losses | Expected credit losses, stage 2 | Loans in the form of interest-bearing securities      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses (1) 0 3
Lifetime expected credit losses | Expected credit losses, stage 2 | Loans to credit institutions      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses     0
Lifetime expected credit losses | Expected credit losses, stage 2 | Loans to the public      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses (292) (45) (22)
Lifetime expected credit losses | Expected credit losses, stage 2 | Off-balance      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses 0 21 (21)
Lifetime expected credit losses | Expected credit losses, stage 3      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses (112) (178) (513)
Lifetime expected credit losses | Expected credit losses, stage 3 | Loans in the form of interest-bearing securities      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses   147 (260)
Lifetime expected credit losses | Expected credit losses, stage 3 | Loans to the public      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses (112) (329) (252)
Lifetime expected credit losses | Expected credit losses, stage 3 | Off-balance      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Net credit losses kr 0 kr 4 kr (1)