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Operating Segment Information - Additional Information (Detail)
€ in Millions
 12 Months Ended
Dec. 31, 2017
EUR (€)
Employees
Facility
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Disclosure of operating segments [line items]      
Number of employees 12,000    
Information about major customers No other single customer contributed 10% or more to the Group's revenue for 2017, 2016 and 2015.    
P&ARP [member]      
Disclosure of operating segments [line items]      
Number of facilities | Facility 4    
Number of employees 3,657    
Revenue from two largest customers | € € 1,364 € 1,220 € 1,318
A&T [member]      
Disclosure of operating segments [line items]      
Number of facilities | Facility 6    
Number of employees 4,008    
AS&I [member]      
Disclosure of operating segments [line items]      
Number of facilities | Facility 15    
Number of employees 3,988