Profit Or Loss [Abstract]
| Concept | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Profit or loss [abstract] | ||||||||||
| Profit (loss) [abstract] | ||||||||||
| Revenue | — | — | 
                                                3 431 455
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                3 508 706
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Other income | — | — | 
                                                48  992
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                25 436
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Profit (loss) from operating activities | — | — | 
                                                301 081
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                341  231
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Finance income | — | — | 
                                                21  399
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                29 578
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Finance costs | — | — | 
                                                95  810
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                61 812
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Profit (loss) before tax | — | — | 
                                                226  670
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                308  997
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Tax expense (income) | — | — | 
                                                51 273
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                59 929
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Profit (loss) | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                175  397
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                175  397
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                249  068
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                249   068
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Profit (loss), attributable to [abstract] | ||||||||||
| Profit (loss), attributable to owners of parent | — | — | 
                                                175 397
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                249  068
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Earnings per share [text block] | — | — | — | — | — | — | — | — | — | — | 
| Earnings per share [abstract] | ||||||||||
| Earnings per share [line items] | ||||||||||
| Basic earnings per share [abstract] | ||||||||||
| Basic earnings (loss) per share | — | — | 
                                                301.00
                                                
                                             | — | — | — | — | 
                                                430.00
                                                
                                             | — | — | 
| Diluted earnings per share [abstract] | ||||||||||
| Diluted earnings (loss) per share | — | — | 
                                                301.00
                                                
                                             | — | — | — | — | 
                                                427.00
                                                
                                             | — | — |