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Information by Geographic Area - Summary of Physical Location of Property, Plant and Equipment (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of property plant and equipment reported based on physical location of assets [line items]      
Property, plant and equipment € 1,517 € 1,477 € 1,255
United States [member]      
Disclosure of property plant and equipment reported based on physical location of assets [line items]      
Property, plant and equipment 681 729  
France [member]      
Disclosure of property plant and equipment reported based on physical location of assets [line items]      
Property, plant and equipment 586 543  
Germany [member]      
Disclosure of property plant and equipment reported based on physical location of assets [line items]      
Property, plant and equipment 156 134  
Czech Republic [member]      
Disclosure of property plant and equipment reported based on physical location of assets [line items]      
Property, plant and equipment 65 45  
Other countries [member]      
Disclosure of property plant and equipment reported based on physical location of assets [line items]      
Property, plant and equipment € 29 € 26