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Property, Plant and Equipment - Additional Information (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Commitments to purchase property, plant and equipment € 323 € 478
Freehold buildings [member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Estimated useful lives 40 years  
Leasehold land and buildings [member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Estimated useful lives 40 years (or life of lease if less)  
Plant and equipment [member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Estimated useful lives 2-20 years