Disclosure Of Interests In Other Entities [Text Block]
| Concept | 
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        2024-01-01 to 2024-12-31  | 
                            
                                
                                    
                                        As at 2024-12-31  | 
                            
                                
                                    
                                        2023-01-01 to 2023-12-31  | 
                            
                                
                                    
                                        2023-01-01 to 2023-12-31  | 
                            
                                
                                    
                                        As at 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  | 
                            
                                
                                    
                                        2023-01-01 to 2023-12-31  | 
                            
                                
                                    
                                        2023-01-01 to 2023-12-31  | 
                            
                                
                                    
                                        2023-01-01 to 2023-12-31  | 
                            
                                
                                    
                                        As at 2022-12-31  | 
                            
                        
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of interests in other entities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of interests in subsidiaries [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of subsidiaries [text block] | — | — | — | — | — | — | 
                                        
                                             | 
                                
                                    — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of subsidiaries [abstract] | |||||||||||||||||||||
| Disclosure of subsidiaries [line items] | |||||||||||||||||||||
| Profit (loss), attributable to non-controlling interests | — | — | — | — | — | — | 
                                        
                                             
                                                71,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | 
                                        
                                             
                                                38,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | — | — | — | — | — | — | — | 
| Current assets | — | — | — | — | — | — | — | — | — | 
                                        
                                             
                                                9,328,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
                                        
                                             
                                                10,184,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | — | — | — | — | — | 
| Non-current assets | — | — | — | — | — | — | — | — | — | 
                                        
                                             
                                                21,283,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
                                        
                                             
                                                20,458,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | — | — | — | — | — | 
| Current liabilities | — | — | — | — | — | — | — | — | — | 
                                        
                                             
                                                8,151,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
                                        
                                             
                                                15,642,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | — | — | — | — | — | 
| Non-current liabilities | — | — | — | — | — | — | — | — | — | 
                                        
                                             
                                                11,636,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
                                        
                                             
                                                5,413,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | — | — | — | — | — | 
| Revenue | — | — | — | — | — | — | 
                                        
                                             
                                                17,985,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | 
                                        
                                             
                                                18,120,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | — | — | — | — | — | — | — | 
| Profit (loss) | 
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                988,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                988,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                71,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,059,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                266,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                228,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                38,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                228,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Comprehensive income | 
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,300,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                276,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                942,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                71,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,371,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                82,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                86,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                48,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                38,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                224,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                216,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                40,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Disclosure of interests in associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [abstract] | |||||||||||||||||||||
| Disclosure of associates [line items] | |||||||||||||||||||||
| Other comprehensive income | 
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                312,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                276,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                46,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                312,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                82,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                180,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                180,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                4,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                216,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                40,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Disclosure of interests in joint arrangements [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of joint ventures [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of joint ventures [abstract] | |||||||||||||||||||||
| Disclosure of joint ventures [line items] | |||||||||||||||||||||
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — | 
                                        
                                             
                                                980,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
                                        
                                             
                                                2,162,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | — | — | — | — | 
                                        
                                             
                                                990,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Tax expense (income) | — | — | — | — | — | — | 
                                        
                                             
                                                302,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | 
                                        
                                             
                                                77,000,000
                                                
                                                    
                                                        DKK
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | — | — | — | — | — | — | — |