Disclosure Of Non-Current Assets Held For Sale And Discontinued Operations [Text Block]
| Concept | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|
| 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) before tax | — | — | 
| Revenue | 
                                                17,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                17,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Profit (loss) from discontinued operations | 
                                                8 028
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                423,000,000
                                                
                                                    
                                                        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 | 
                                                1,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                12,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) operating activities | 
                                                660,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 166
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities [abstract] | ||
| Cash flows from (used in) investing activities, continuing operations | 
                                                1,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                3,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities, discontinued operations | 
                                                143,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                108,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities | 
                                                144,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                111,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities [abstract] | ||
| Cash flows from (used in) financing activities, continuing operations | 
                                                23,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities, discontinued operations | 
                                                188,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 317
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities | 
                                                165,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 315
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Profit (loss) from continuing operations attributable to non-controlling interests | 
                                                245,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Profit (loss) from discontinued operations attributable to non-controlling interests | 
                                                6 376
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                274,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |