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Other financial assets - Other non-current financial assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other financial assets [Line Items]      
Non-current financial assets at fair value through profit or loss € 284 € 322 € 283
Non-current financial assets measured at fair value through other comprehensive income 258 284 300
Non-current financial assets at amortised cost 77 54 47
Other non-current financial assets 619 660 € 630
Acquisitions 105 150  
Sales redemptions 58 86  
Value adjustment through OCI (17) (35)  
Value adjustment through P&L (39) 5  
Translation Differences And Other (44) 2  
Reclassifications 12 (2)  
Financial assets impaired [member]      
Other financial assets [Line Items]      
Impairment loss on financial assets   (5)  
Financial assets at fair value through profit or loss, category [member]      
Other financial assets [Line Items]      
Acquisitions 71 114  
Sales redemptions 33 75  
Value adjustment through OCI 0 0  
Value adjustment through P&L (39) 5  
Translation Differences And Other (29) (2)  
Reclassifications (8) 1  
Financial assets at fair value through profit or loss, category [member] | Financial assets impaired [member]      
Other financial assets [Line Items]      
Impairment loss on financial assets   (3)  
Financial assets at fair value through other comprehensive income, category [member]      
Other financial assets [Line Items]      
Acquisitions 14 18  
Sales redemptions 14 3  
Value adjustment through OCI (17) (35)  
Translation Differences And Other (14) 5  
Reclassifications 5 (2)  
Financial assets at amortised cost, category [member]      
Other financial assets [Line Items]      
Acquisitions 20 18  
Sales redemptions 11 8  
Value adjustment through P&L 0 0  
Translation Differences And Other (1) (1)  
Reclassifications € 15 (1)  
Financial assets at amortised cost, category [member] | Financial assets impaired [member]      
Other financial assets [Line Items]      
Impairment loss on financial assets   € (1)