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Operating Segment Information - Summary of Segment Assets (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of segment assets [line items]        
Total Assets € 3,711 € 3,787    
Deferred income tax assets 164 252    
Cash and cash equivalents 269 347 € 472 € 991
Other financial assets 179 166    
Segment [member]        
Disclosure of segment assets [line items]        
Total Assets 3,099 3,022    
Segment [member] | P&ARP [member]        
Disclosure of segment assets [line items]        
Total Assets 1,629 1,652    
Segment [member] | A&T [member]        
Disclosure of segment assets [line items]        
Total Assets 769 768    
Segment [member] | AS&I [member]        
Disclosure of segment assets [line items]        
Total Assets 449 390    
Segment [member] | Holdings & Corporate [member]        
Disclosure of segment assets [line items]        
Total Assets 252 212    
Unallocated amounts [member]        
Disclosure of segment assets [line items]        
Deferred income tax assets 164 252    
Cash and cash equivalents 269 347    
Other financial assets € 179 € 166