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Operating Segment Information - Summary of Segment Assets (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]        
Total Assets € 3,901 € 3,711    
Deferred income tax assets 163 164    
Cash and cash equivalents 164 269 € 347 € 472
Other financial assets 104 179    
Segment [member]        
Disclosure of operating segments [line items]        
Total Assets 3,470 3,099    
Segment [member] | P&ARP [member]        
Disclosure of operating segments [line items]        
Total Assets 1,791 1,629    
Segment [member] | A&T [member]        
Disclosure of operating segments [line items]        
Total Assets 831 769    
Segment [member] | AS&I [member]        
Disclosure of operating segments [line items]        
Total Assets 544 449    
Segment [member] | Holdings & Corporate [member]        
Disclosure of operating segments [line items]        
Total Assets 304 252    
Unallocated amounts [member]        
Disclosure of operating segments [line items]        
Deferred income tax assets 163 164    
Cash and cash equivalents 164 269    
Other financial assets € 104 € 179