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Other financial assets - Other non-current financial assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other financial assets [Line Items]      
Non-current financial assets at fair value through profit or loss € 248 € 136 € 116
Non-current financial assets measured at fair value through other comprehensive income 146 72 198
Non-current financial assets at amortised cost 37 40 46
Other non-current financial assets 430 248 € 360
Acquisitions 131 75  
Sales redemptions 65 174  
Value adjustment through OCI 3 (33)  
Value adjustment through P&L 133 18  
Translation Differences And Other (17) 3  
Reclassifications (3) (1)  
Financial assets at fair value through profit or loss, category [member]      
Other financial assets [Line Items]      
Acquisitions 44 48  
Sales redemptions 59 48  
Value adjustment through OCI 0 0  
Value adjustment through P&L 133 18  
Translation Differences And Other (6) 1  
Reclassifications 0 1  
Financial assets at fair value through other comprehensive income, category [member]      
Other financial assets [Line Items]      
Acquisitions 82 15  
Sales redemptions 3 109  
Value adjustment through OCI 3 (33)  
Value adjustment through P&L 0 0  
Translation Differences And Other (5) 2  
Reclassifications (3) (1)  
Financial assets at amortised cost, category [member]      
Other financial assets [Line Items]      
Acquisitions 4 11  
Sales redemptions 2 17  
Value adjustment through OCI 0 0  
Value adjustment through P&L 0 1  
Translation Differences And Other (6) 0  
Reclassifications € 0 € (1)