Statement Of Comprehensive Income [Abstract]
| Concept | 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 | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||
| Profit (loss) | 
                                                8 564
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                6 621
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 943
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 943
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                141,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                413,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                141,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                272,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Other comprehensive income [abstract] | ||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||
| Other comprehensive income, before tax, gains (losses) from investments in equity instruments | 
                                                48,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                30,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | 
                                                21,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                46,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||
| Exchange differences on translation [abstract] | ||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | 
                                                583,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                194,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Cash flow hedges [abstract] | ||||||||||
| Other comprehensive income, before tax, cash flow hedges | 
                                                5,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                9,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Financial assets measured at fair value through other comprehensive income [abstract] | ||||||||||
| Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | 
                                                16,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | 
                                                5,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                11,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Other comprehensive income | 
                                                540,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                398,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                142,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                142,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                23,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                208,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
                                                23,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                185,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Comprehensive income | 
                                                8 024
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                6 223
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 943
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1 801
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                142,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                118,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                205,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                141,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                23,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                87,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Comprehensive income attributable to [abstract] | ||||||||||
| Comprehensive income, attributable to owners of parent | 
                                                1 801
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                118,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | 
| Comprehensive income, attributable to non-controlling interests | 
                                                6 223
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | 
                                                87,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — |