Analysis Of Income And Expense [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 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||
| Revenue [abstract] | ||||||||||
| Revenue | — | — | 
                                                3 431 455
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                3 508 706
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Material income and expense [abstract] | ||||||||||
| Selling, general and administrative expense [abstract] | ||||||||||
| Selling expense | — | — | 
                                                295  265
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                257  598
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Miscellaneous other comprehensive income [abstract] | ||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | — | — | 
                                                12 289
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                21 451
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||
| Share of profit (loss) of associates accounted for using equity method | — | — | 
                                                529,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                1 5 6
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||
| Comprehensive income | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                152  697
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                175  397
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                22 700
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                41  710
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                290  778
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                249  068
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||
| Comprehensive income, attributable to owners of parent | — | — | 
                                                152 697
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
                                                290  778
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — |