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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, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net € 60 € 57
Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Amounts included in Building/Machinery and Equipment under finance lease net 25 28
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 35 29
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 92 81
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 30 31
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 62 50
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 (32) (24)
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 (5) (3)
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 € (27) € (21)