Disclosure Of Investment Property [Text Block]
| Concept | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|
| Disclosure of investment property [text block] | — | 
                                                Note 6 – Investment properties
                                                
                                             | — | — | 
| Disclosure of detailed information about investment property [text block] | — | — | — | — | 
| Disclosure of detailed information about investment property [abstract] | ||||
| Disclosure of detailed information about investment property [line items] | ||||
| Reconciliation of changes in investment property [abstract] | ||||
| Investment property | 
                                                3,963,832,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                4,910,925,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Changes in investment property [abstract] | ||||
| Gains (losses) on fair value adjustment, investment property | — | 
                                                483,177,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1,172,738,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |