Disclosure Of Financial Instruments [Text Block]
| Concept | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|
| Disclosure of financial instruments [text block] | — | — | 
| Description of accounting policy for financial instruments [text block] | 
                                                Note 7.
                                                
                                             | — | 
| Income, expense, gains or losses of financial instruments [abstract] | ||
| Gains (losses) on financial instruments [abstract] | ||
| Other comprehensive income, before tax, gains (losses) from investments in equity instruments | 
                                                48,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                30,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |