Disclosure Of First-Time Adoption [Text Block]
| Concept | 2023-01-01 to 2023-12-31 | As at 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 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of first-time adoption [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of comparative information prepared under previous GAAP [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of comparative information prepared under previous GAAP [abstract] | ||||||||||||||||||||||||||||||||||
| Disclosure of comparative information prepared under previous GAAP [line items] | ||||||||||||||||||||||||||||||||||
| Equity | — | 
                                                5 364
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                2 104
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                3 202
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                218,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                149,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                22,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2 162
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                403,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                3 587
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
                                                883,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                218,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                4 511
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                386,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                22,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                149,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                924,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                22,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                296,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                3 537
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                930,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                881,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                4 418
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                218,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                149,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Comprehensive income | 
                                                8 024
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1 801
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                6 223
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 943
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                142,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                205,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                141,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                87,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                23,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                118,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
| Profit (loss) | 
                                                8 564
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                1 943
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                6 621
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 943
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                413,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                141,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                272,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                141,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | — | — |