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Debt - Short-term debt (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt [Abstract]      
Short-term bank borrowings, total € 76 € 71  
Forward contracts short term 88 49  
Current portion of non-current borrowings 1,230 552  
Current borrowings and current portion of non-current borrowings € 1,394 € 672 € 1,585