Disclosure Of Cash Flow Statement [Text Block]
| Concept | 
                                    
                                        As at 2023-12-31  | 
                            
                                
                                    
                                        2023-01-01 to 2023-12-31  | 
                            
                                
                                    
                                        As at 2022-12-31  | 
                            
                                
                                    
                                        As at 2021-12-31  | 
                            
                        
|---|---|---|---|---|
| Disclosure of cash flow statement [text block] | — | 
                                        
                                             | 
                                
                                    — | — | 
| Cash and cash equivalents if different from statement of financial position [abstract] | ||||
| Cash and cash equivalents | 
                                        
                                             
                                                107  898
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                117  0 0 2
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                130    611
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             
                                        
                                     |