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Capital and funding - Additional Information (Detail) - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]    
Number of shares cancelled 122,965,077  
Unilever N.V. [member] | Ordinary Shares [member]    
Disclosure of classes of share capital [line items]    
Number of shares acquired 66,202,168 53,003,099
Number of treasury shares held 263,349,111 201,538,909
Unilever N.V. [member] | Ordinary Shares [member] | Share Based Compensation [Member]    
Disclosure of classes of share capital [line items]    
Number of treasury shares held 9,336,215  
Unilever PLC [member]    
Disclosure of classes of share capital [line items]    
Nominal dividend paid on the deferred stock of PLC 6.00%  
Number of shares acquired 65,458,433 53,359,284
Number of treasury shares held 24,334,848 84,463,561
Number of shares cancelled 122,965,077  
Unilever PLC [member] | Share Based Compensation [Member]    
Disclosure of classes of share capital [line items]    
Number of treasury shares held 5,674,214