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) before tax | 
                                        
                                             
                                                4,446,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                5,024,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Revenue | 
                                        
                                             
                                                10,292,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                10,551,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Cash flows from continuing and discontinued operations [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Cash flows from (used in) operating activities | 
                                        
                                             
                                                16,289,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                5,258,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Cash flows from (used in) investing activities [abstract] | ||
| Cash flows from (used in) investing activities | 
                                        
                                             
                                                200,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                28,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Cash flows from (used in) financing activities [abstract] | ||
| Cash flows from (used in) financing activities | 
                                        
                                             
                                                4,595,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                3,506,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             
                                        
                                     |