Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|
| Statement of changes in net assets available for benefits [abstract] | ||||
| Assets of benefit plan | 
                                                1 555
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                1 555
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
| Reconciliation of changes in net assets available for benefits [abstract] | ||||
| Changes in net assets available for benefits [abstract] | ||||
| Tax expense (income) | — | 
                                                5 639
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                4 685
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             |