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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation and Amortisation loss € (171) € (155) € (140)
Depreciation expense and impairment loss (171) (155) (592)
Impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense and impairment loss     (452)
Cost of sales.      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation and Amortisation loss (160) (147) (132)
Selling and administrative expenses [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation and Amortisation loss (8) (6) (6)
Research and development expenses [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation and Amortisation loss € (3) € (2) € (2)