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Capital and Funding - Summary of Share Capital (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2018
€ / shares
shares
Dec. 31, 2018
£ / shares
shares
Dec. 31, 2017
€ / shares
shares
Dec. 31, 2017
£ / shares
shares
Dec. 31, 2016
€ / shares
Dec. 31, 2016
£ / shares
Disclosure of classes of share capital [line items]            
Cancellation of shares 122,965,077          
Treasury shares 24,334,848 24,334,848        
Unilever PLC [member]            
Disclosure of classes of share capital [line items]            
Par value per share | £ / shares   £ 0.0311   £ 0.0311   £ 0.0311
Cancellation of shares 122,965,077          
Conversion rate for ordinary shares nominal value | € / shares € 5.143          
Description of conversion of currency Conversion rate for PLC ordinary shares nominal value to euros is £1 = €5.143 (which is calculated by dividing the nominal value of NV ordinary shares by the nominal value of PLC ordinary shares).          
Unilever N.V. [member]            
Disclosure of classes of share capital [line items]            
Par value per share | € / shares € 0.16   € 0.16   € 0.16  
Number of authorised shares 3,000,000,000 3,000,000,000 3,000,000,000 3,000,000,000    
Ordinary Shares [member] | Unilever PLC [member]            
Disclosure of classes of share capital [line items]            
Par value per share | £ / shares   £ 0.031   £ 0.031    
Number of shares issued 1,187,191,284 1,187,191,284 1,310,156,361 1,310,156,361    
Ordinary Shares [member] | Unilever N.V. [member]            
Disclosure of classes of share capital [line items]            
Par value per share | € / shares € 0.16   € 0.16      
Number of shares issued 1,714,727,700 1,714,727,700 1,714,727,700 1,714,727,700    
Ordinary Special Shares [member] | Unilever N.V. [member]            
Disclosure of classes of share capital [line items]            
Par value per share | € / shares € 428.57   € 428.57      
Deferred Stock [Member] | Unilever PLC [member]            
Disclosure of classes of share capital [line items]            
Par value per share | £ / shares   £ 1   £ 1    
Number of shares issued 100,000 100,000 100,000 100,000    
Special Shares [Member] | Unilever N.V. [member]            
Disclosure of classes of share capital [line items]            
Number of shares issued 2,400 2,400 2,400 2,400