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Property Plant and Equipment - Summary of Amounts Included in Building, Machinery and Equipment Under a Finance Lease (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net € 77 € 60
Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net 24 25
Machinery and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net 53 35
Gross value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net 110 92
Gross value [member] | Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net 31 30
Gross value [member] | Machinery and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net 79 62
Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net (33) (32)
Accumulated depreciation [member] | Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net (7) (5)
Accumulated depreciation [member] | Machinery and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net € (26) € (27)