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Property Plant and Equipment - Summary of Depreciation Expense and Impairment Losses Relating to Property Plant and Equipment and Intangible Assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation and Amortisation loss € (197) € (171) € (155)
Cost of sales [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation and Amortisation loss (184) (160) (147)
Selling and administrative expenses [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation and Amortisation loss (9) (8) (6)
Research and development expenses [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation and Amortisation loss € (4) € (3) € (2)