Disclosure Of Intangible Assets [Text Block]
| Concept | 
                                    
                                        As at 2024-12-31  | 
                            
                                
                                    
                                        As at 2023-12-31  | 
                            
                        
|---|---|---|
| Disclosure of intangible assets [text block] | — | — | 
| Disclosure of reconciliation of changes in intangible assets and goodwill [text block] | — | — | 
| Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] | ||
| Disclosure of reconciliation of changes in intangible assets and goodwill [line items] | ||
| Reconciliation of changes in intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill | 
                                        
                                             
                                                6 294,4
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                6 118,0
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     |