Disclosure Of Non-Current Assets Held For Sale And Discontinued Operations [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|
| Disclosure of non-current assets held for sale and discontinued operations [text block] | — | — | 
| Disclosure of analysis of single amount of discontinued operations [text block] | — | — | 
| Disclosure of analysis of single amount of discontinued operations [abstract] | ||
| Disclosure of analysis of single amount of discontinued operations [line items] | ||
| Profit (loss) from discontinued operations | 
                                                121,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                141,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from continuing and discontinued operations [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Cash flows from (used in) operating activities, continuing operations | 
                                                36,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                7,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) operating activities, discontinued operations | 
                                                5,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                28,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities [abstract] | ||
| Cash flows from (used in) investing activities, continuing operations | 
                                                85,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                76,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities, discontinued operations | 
                                                8,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                32,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities [abstract] | ||
| Cash flows from (used in) financing activities, continuing operations | 
                                                47,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                76,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities, discontinued operations | 
                                                10,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                17,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Increase (decrease) in cash and cash equivalents, discontinued operations | 
                                                7,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                21,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |