Disclosure Of Interests In Other Entities [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of interests in other entities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of interests in subsidiaries [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of subsidiaries [text block] | — |  | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of subsidiaries [abstract] | |||||||||||||||
| Disclosure of subsidiaries [line items] | |||||||||||||||
| Current assets | — | — | — | 
                                                8,095,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                7,565,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-current assets | — | — | — | 
                                                6,245,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                6,544,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
| Current liabilities | — | — | — | 
                                                1,601,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                3,853,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-current liabilities | — | — | — | 
                                                7,432,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                5,267,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
| Revenue | — | 
                                                7,262,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                6,846,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Profit (loss) | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                264,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                264,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,270,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,270,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Comprehensive income | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                336,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                42,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                30,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                264,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,278,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                20,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,267,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                31,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Disclosure of interests in associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of associates [abstract] | |||||||||||||||
| Disclosure of associates [line items] | |||||||||||||||
| Other comprehensive income | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                72,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                42,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                30,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                8,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                20,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                28,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Disclosure of interests in joint arrangements [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of joint ventures [text block] | — | 
                                                Die BioDarou P.J.S. Co. mit Sitz in Teheran, Iran, wird als Gemeinschaftsunternehmen at equity in den Konzernabschluss einbezogen.
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of joint ventures [abstract] | |||||||||||||||
| Disclosure of joint ventures [line items] | |||||||||||||||
| Cash and cash equivalents | — | — | — | 
                                                1,078,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,081,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                1,166,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Tax expense (income) | — | 
                                                202,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                207,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — |