Statement Of Changes In Equity [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 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||
| Statement of changes in equity [line items] | ||||||||||
| Dividends recognised as distributions to owners of parent | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                102  333
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                102  333
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                101 474
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                101  474
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Increase (decrease) through conversion of convertible instruments, equity | 
                                                716,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                69  195
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                69  911
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Increase (decrease) through transactions with owners, equity | 
                                                716,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                69  195
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                32 422
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                102  333
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                101  474
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                101  474
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             |