Disclosure Of Entity's Operating Segments [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|
| Disclosure of entity's operating segments [text block] | 
                                                Segmentergebnis 2024
                                                
                                             | — | — | — | — | — | 
| Disclosure of operating segments [text block] | — | — | — | — | — | — | 
| Disclosure of operating segments [abstract] | ||||||
| Disclosure of operating segments [line items] | ||||||
| Interest expense | 
                                                171,062
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                121,058
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Interest income (expense) | 
                                                241,606
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                248,646
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Share of profit (loss) of associates and joint ventures accounted for using equity method | 
                                                78,912
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                90,432
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Tax expense (income) | 
                                                23,560
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                27,204
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Profit (loss) before tax | 
                                                186,797
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                206,272
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Profit (loss) | 
                                                163,236
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                163,236
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                179,068
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                179,068
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Assets | — | 
                                                11.072.287
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                10.673.064
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Investments accounted for using equity method | — | 
                                                875,718
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                813,907
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | 
                                                414,398
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                226,375
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) investing activities | 
                                                53,255
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                112,422
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
| Cash flows from (used in) financing activities | 
                                                32,012
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                61,688
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — |