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Fair value of financial assets and liabilities - Reconciliation of Level 3 fair value measurements (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value of financial assets and liabilities [Line Items]      
Financial assets € 8,154 € 6,445  
Financial liabilities 9,585 8,118  
Level 3 of fair value hierarchy [member]      
Fair value of financial assets and liabilities [Line Items]      
Financial liabilities 318 354 € 409
Assumed in a Business Combination 70    
Utilizations (15) 44  
Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, liabilities (93) (35)  
Financial income and expenses 6 [1] 14  
Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, liabilities (6) [2] 4 [3]  
Financial liabilities recognised as of acquisition date   6  
Financial assets, class [member] | Level 3 of fair value hierarchy [member]      
Fair value of financial assets and liabilities [Line Items]      
Financial assets 411 212  
Purchases, fair value measurement, assets 127 54  
Sales, fair value measurement, assets 60 24  
Financial income and expenses 129 [1] 2  
Gains (losses) recognised in other comprehensive income, fair value measurement, assets (8) [2] (120) [3]  
Receivables Held To Collect And Sell € 11 € 46  
Financial assets, class [member] | Level 3 of fair value hierarchy [member] | IFRS 9 [Member]      
Fair value of financial assets and liabilities [Line Items]      
Financial assets     € 255
[1] Refer to Financial income and expenses for details. 
[2] Includes translation differences
[3] Includes translation differences