Disclosure Of Intangible Assets [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|
| Disclosure of intangible assets [text block] |  | — | — | — | — | 
| Disclosure of detailed information about intangible assets [text block] | — | — | — | — | — | 
| Disclosure of detailed information about intangible assets [abstract] | |||||
| Disclosure of detailed information about intangible assets [line items] | |||||
| Reconciliation of changes in intangible assets other than goodwill [abstract] | |||||
| Intangible assets other than goodwill | — | 
                                                2,982,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                3,190,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Research and development expense | 
                                                1,747,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1,890,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                2,091,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |