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Acquisitions and Disposals - Additional Information (Detail) - EUR (€)
 12 Months Ended
Sep. 22, 2017
Dec. 31, 2017
Nov. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Acquisitions and Disposals [Line Items]          
Total consideration   € 4,912,000,000   € 2,069,000,000  
Cash consideration   4,825,000,000      
Fair value of assets and liabilities recognised for the acquisition   2,423,000,000   929,000,000 € 999,000,000
Provisional estimate of the goodwill arising on the acquisition   16,881,000,000   € 17,624,000,000  
Revenue of acquiree   230,000,000      
Operating profit (loss) of acquiree since acquisition date   32,000,000      
Revenue of group if acquisition completed   54,440,000,000      
Operating profit of group if acquisition completed   9,060,000,000      
Goodwill expected to be tax deductible   568,000,000      
Contingent liabilities acquired   € 0      
Description of goodwill   Goodwill represents the future value which the Group believes it will obtain through operational synergies and the application of acquired company ideas to existing Unilever channels and businesses.      
Global Spreads Business Excluding South Africa [member]          
Disclosure of Acquisitions and Disposals [Line Items]          
Expected date of business disposal   During 2018      
Spreads Business in South Africa [Member]          
Disclosure of Acquisitions and Disposals [Line Items]          
Acquisition percentage 25.75%        
South Africa Holdings [Member]          
Disclosure of Acquisitions and Disposals [Line Items]          
Cash consideration payable € 331,000,000        
Unilever south Africa holdings [Member]          
Disclosure of Acquisitions and Disposals [Line Items]          
Expected date of business disposal   During 2018      
Carver Korea [Member]          
Disclosure of Acquisitions and Disposals [Line Items]          
Total consideration   € 2,284,000,000      
Acquisition percentage     98.00%    
Cash consideration   2,284,000,000 € 2,284,000,000    
Fair value of assets and liabilities recognised for the acquisition   1,281,000,000 1,281,000,000    
Provisional estimate of the goodwill arising on the acquisition     € 1,030,000,000    
Total acquisition-related costs incurred   1,000,000      
Revenue of acquiree   75,000,000      
Operating profit (loss) of acquiree since acquisition date   23,000,000      
Revenue if all above acquisitions had taken place at beginning of year   53,984,000,000      
Operating profit if all above acquisitions had taken place at beginning of year   € 8,982,000,000