v3.25.4
Significant accounting policies - Provisions for expected credit losses (Details)
kr in Millions
 12 Months Ended
Dec. 31, 2025
SEK (kr)
item
Dec. 31, 2024
SEK (kr)
Dec. 31, 2023
SEK (kr)
Sensitivity analysis      
Decrease in number of steps of deterioration for sensitivity analysis | item 1    
Increase (decrease) in impairment of financial instruments if significant increase in credit risk had been one step of deterioration less kr 31 kr 19  
Increase in number of steps of deterioration for sensitivity analysis | item 1    
Increase (decrease) in impairment of financial instruments if significant increase in credit risk had been one step of deterioration more kr (2) 0  
Number of scenarios prepared for each PD curve | item 3    
Weight of downturn scenario for sensitivity analysis 100.00%    
Increase (decrease) in impairment of financial instruments if downturn scenario weighted 100 percent kr 70 65  
Weight of upturn scenario for sensitivity analysis 100.00%    
Increase (decrease) in impairment of financial instruments if upturn scenario weighted 100 percent kr (53) (43)  
Increase in future cash flows for sensitivity analysis 10.00%    
Decrease in future cash flows for sensitivity analysis 10.00%    
Increase (decrease) in operating profit due to increase in future cash flows kr 81 53  
Increase (decrease) in equity due to increase in future cash flows 64 42  
Increase (decrease) in operating profit due to decrease in future cash flows 81 53  
Increase (decrease) in equity due to decrease in future cash flows 64 42  
Gross carrying amount      
Sensitivity analysis      
Lending including off-balance 355,038 350,246 kr 346,506
Accumulated impairment      
Sensitivity analysis      
Lending including off-balance kr (807) kr (526) kr (795)