Statement Of Comprehensive Income [Abstract]
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 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 | 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 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | |||||||||||||||||||||
| Profit (loss) | — | — | — | — | 
                                                698,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                463,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,605,000,000
                                                
                                                    
                                                        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 | — | — | — | — | 
                                                21,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                20,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                32,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — | — | — | 
                                                18,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                26,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                101,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | |||||||||||||||||||||
| Exchange differences on translation [abstract] | |||||||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, before tax | — | — | — | — | 
                                                768,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                579,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                748,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Cash flow hedges [abstract] | |||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax | — | — | — | — | 
                                                21,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                29,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                29,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | |||||||||||||||||||||
| Income tax relating to investments in equity instruments included in other comprehensive income | — | — | — | — | 
                                                9,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                3,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | — | — | — | — | 
                                                12,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                3,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                20,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | |||||||||||||||||||||
| Income tax relating to exchange differences on translation of foreign operations included in other comprehensive income | — | — | — | — | 
                                                8,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                2,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Income tax relating to cash flow hedges included in other comprehensive income | — | — | — | — | 
                                                3,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                2,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                10,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Other comprehensive income | — | — | — | — | 
                                                731,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                637,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                823,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Comprehensive income | 
                                                27,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                751,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                707,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                6,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                33,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                5,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                11,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,100,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,101,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                488,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                604,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                17,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                8,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                782,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                1,527,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                4,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                23,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                32,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                786,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                749,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Comprehensive income attributable to [abstract] | |||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | 
                                                27,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                1,101,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                786,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | 
                                                6,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | 
                                                1,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                4,000,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | — | — |