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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair value of financial assets and liabilities - Text Details (Detail) [Line Items]      
Financial assets € 6,445 € 6,718  
Financial liabilities 8,118 7,858  
Level 3 of fair value hierarchy [member]      
Fair value of financial assets and liabilities - Text Details (Detail) [Line Items]      
Financial liabilities 354 409 € 66
Assumed in a Business Combination 6    
Utilizations (44) 48  
Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, liabilities (35) 5  
Financial income and expenses 14 12  
Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, liabilities 4 [1] 5 [2]  
Level 3 of fair value hierarchy [member] | Financial assets, class [member]      
Fair value of financial assets and liabilities - Text Details (Detail) [Line Items]      
Financial assets 212 255 € 372
Purchases, fair value measurement, assets 54 30  
Sales, fair value measurement, assets 24 35  
Financial income and expenses 2 0  
Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, assets (120) [1] (145) [2]  
Receivables Held To Collect And Sell € 46 € (15)  
[1] Includes translation differences
[2] Includes translation differences