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Cash and Cash Equivalents - Additional Information (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of cash and cash equivalents [line Items]    
Cash in bank and on hand € 164 € 269
Subsidiaries in capital control restrictions countries [member]    
Disclosure of cash and cash equivalents [line Items]    
Cash in bank and on hand € 18 € 12