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Property Plant and Equipment - Summary of Property Plant and Equipment (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning € 1,477 € 1,255
Additions 282 362
Disposals (4) (11)
Depreciation expense (159) (144)
Transfer during the period 8  
Effects of changes in foreign exchange rates (87) 15
Net balance, ending 1,517 1,477
Gross value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 2,187  
Net balance, ending 2,291 2,187
Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning (710)  
Net balance, ending (774) (710)
Land and property rights.[member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 19 21
Additions 1  
Depreciation expense (4) (4)
Transfer during the period   1
Effects of changes in foreign exchange rates (2) 1
Net balance, ending 14 19
Land and property rights.[member] | Gross value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 27  
Net balance, ending 25 27
Land and property rights.[member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning (8)  
Net balance, ending (11) (8)
Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 209 158
Additions 2 6
Disposals (1)  
Depreciation expense (13) (13)
Transfer during the period 18 55
Effects of changes in foreign exchange rates (9) 3
Net balance, ending 206 209
Buildings [member] | Gross value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 324  
Net balance, ending 321 324
Buildings [member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning (115)  
Net balance, ending (115) (115)
Machinery and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 1,020 773
Additions 50 56
Disposals (3) (6)
Depreciation expense (135) (120)
Transfer during the period 223 309
Effects of changes in foreign exchange rates (66) 8
Net balance, ending 1,089 1,020
Machinery and equipment [member] | Gross value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 1,581  
Net balance, ending 1,712 1,581
Machinery and equipment [member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning (561)  
Net balance, ending (623) (561)
Construction Work in Progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 221 296
Additions 224 297
Disposals   (5)
Transfer during the period (237) (370)
Effects of changes in foreign exchange rates (10) 3
Net balance, ending 198 221
Construction Work in Progress [member] | Gross value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 228  
Net balance, ending 204 228
Construction Work in Progress [member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning (7)  
Net balance, ending (6) (7)
Other [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 8 7
Additions 5 3
Depreciation expense (7) (7)
Transfer during the period 4 5
Net balance, ending 10 8
Other [member] | Gross value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning 27  
Net balance, ending 29 27
Other [member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net balance, beginning (19)  
Net balance, ending € (19) € (19)