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Operating Costs and Non-underlying Items - Summary of Non-underlying Items Related to Gross Profit and Operating Costs (Parenthetical) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Non-underlying Items [Line Items]      
Gain from sale of Ades Soy beverage business € 309    
Legal expense relates to investigations by national competition authorities € 80   € 86
Legal expense relates to other one-off legal cases     14
Argentina [Member]      
Non-underlying Items [Line Items]      
Foreign exchange losses resulting from remeasurement   € 18 52
Venezuela [Member]      
Non-underlying Items [Line Items]      
Foreign exchange losses resulting from remeasurement     € 84