Disclosure Of Fair Value Measurement [Text Block]
| Concept | As at 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | 
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| Disclosure of fair value measurement [text block] | — | — |  | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of fair value measurement of assets [abstract] | ||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | ||||||||||||||||
| Assets | — | — | — | — | 
                                                3 760 700
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                3 605 539
                                                
                                                    
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                                             | — | — | — | — | — | — | — | — | — | 
| Reconciliation of changes in fair value measurement, assets [abstract] | ||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of fair value measurement of liabilities [abstract] | ||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | ||||||||||||||||
| Liabilities | — | — | — | — | 
                                                2  110  184
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                2 075 298
                                                
                                                    
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                                             | — | — | — | — | — | — | — | — | — | 
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of fair value measurement of equity [abstract] | ||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | ||||||||||||||||
| Equity | 
                                                37 275
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                183  714
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                1 379 074
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                1 650 516
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                50 453
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                1 530 241
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                1  306  010
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                36  559
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                73  153
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                114  519
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                1 158 416
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                1 340 937
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                31  443
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                114  519
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                36  559
                                                
                                                    
                                                        SEK
                                                    
                                                
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| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |