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Operating Segment Information - Summary of Segment Capital Expenditures (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of segment capital expenditures [line items]      
Segment capital expenditures € (276) € (355) € (350)
P&ARP [member]      
Disclosure of segment capital expenditures [line items]      
Segment capital expenditures (115) (166) (170)
A&T [member]      
Disclosure of segment capital expenditures [line items]      
Segment capital expenditures (73) (96) (112)
AS&I [member]      
Disclosure of segment capital expenditures [line items]      
Segment capital expenditures (83) (84) (60)
Holdings & Corporate [member]      
Disclosure of segment capital expenditures [line items]      
Segment capital expenditures € (5) € (9) € (8)