Disclosure Of Business Combinations [Text Block]
| Concept | As at 2024-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|
| Disclosure of business combinations [text block] | — | — | — | — | 
| Disclosure of reconciliation of changes in goodwill [text block] | — | — | — | — | 
| Disclosure of reconciliation of changes in goodwill [abstract] | ||||
| Disclosure of reconciliation of changes in goodwill [line items] | ||||
| Reconciliation of changes in goodwill [abstract] | ||||
| Goodwill | 
                                                10,383,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                9,876,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Changes in goodwill [abstract] | ||||
| Impairment loss recognised in profit or loss, goodwill | — | — | 
                                                8,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,357,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |