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Fair value of financial assets and liabilities - Reconciliation of the fair value hierarchy (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Fair value of financial assets and liabilities - Text Details (Detail) [Line Items]      
Financial assets € 6,718   € 7,909
Financial liabilities 7,858   7,292
Level 3 of fair value hierarchy [member]      
Fair value of financial assets and liabilities - Text Details (Detail) [Line Items]      
Financial assets   € 420  
Financial liabilities 409 € 66 66
Financial assets, class [member] | Level 3 of fair value hierarchy [member]      
Fair value of financial assets and liabilities - Text Details (Detail) [Line Items]      
Financial assets 255   € 372
Purchases, fair value measurement, assets 30    
Sales, fair value measurement, assets (35)    
Financial income and expenses 0    
Gains (losses) recognised in other comprehensive income, fair value measurement, assets [1] (145)    
Receivables Held To Collect And Sell € (15)    
[1] Includes translation differences