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Accounting Information and Policies - Additional Information (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Summary Of Significant Accounting Policies [Line Items]    
Prior year restatement recognised in equity   € 393
Net monetary gain/(loss) € 122  
Hyperinflation restatement [member]    
Disclosure Of Summary Of Significant Accounting Policies [Line Items]    
Total assets 538  
Hyperinflationary adjustment, property, plant and equipment 171  
Increase in goodwill 369  
Prior year restatement recognised in equity 393  
Turnover (75)  
Operating profit (37)  
Net monetary gain/(loss) 122  
IFRS sixteen [member]    
Disclosure Of Summary Of Significant Accounting Policies [Line Items]    
Estimated increase in total assets 1,700  
Estimated split in land and buildings 1,300  
Estimated split in plant and machinery 400  
Expected financial liabilities increase 1,900  
Expected increase in depreciation 470  
Reduction in operating lease expenses 550  
Increase in operating profit 80  
Expected increase in finance cost 90  
Increase cash flows from operating activities 550  
IFRS sixteen [member] | Europe [member]    
Disclosure Of Summary Of Significant Accounting Policies [Line Items]    
Estimated increase in total assets 500  
IFRS sixteen [member] | Americas [member]    
Disclosure Of Summary Of Significant Accounting Policies [Line Items]    
Estimated increase in total assets 500  
IFRS sixteen [member] | Asia/AMET/RUB [member]    
Disclosure Of Summary Of Significant Accounting Policies [Line Items]    
Estimated increase in total assets € 700