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Capital and Funding - Summary of Share Capital (Parenthetical) (Detail) - € / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Unilever PLC [member]    
Disclosure of classes of share capital [line items]    
Conversion rate for ordinary shares nominal value € 1.121 € 5.143
Description of conversion of currency The ordinary share capital of PLC is now translated using the conversion rate at 29 November 2020 of £1 = € 1.121.  
Unilever N.V. [member]    
Disclosure of classes of share capital [line items]    
Par value per share   € 0.16
Ordinary Shares [member] | Unilever PLC [member]    
Disclosure of classes of share capital [line items]    
Number of shares issued 2,629,243,772 1,168,530,650
Cancellation of shares   18,660,634
Ordinary Shares [member] | Unilever N.V. [member]    
Disclosure of classes of share capital [line items]    
Number of shares issued   1,460,714,804
Cancellation of shares   254,012,896
Ordinary Special Shares [member] | Unilever N.V. [member]    
Disclosure of classes of share capital [line items]    
Par value per share   € 428.57
Number of shares issued   2,400
Deferred Stock [Member] | Unilever PLC [member]    
Disclosure of classes of share capital [line items]    
Number of shares issued   100,000
Deferred Stock [Member] | Unilever N.V. [member]    
Disclosure of classes of share capital [line items]    
Par value per share   € 1
Special Shares [Member] | Unilever N.V. [member]    
Disclosure of classes of share capital [line items]    
Number of shares issued   2,400
Shares Issued to NV Shareholders [member] | Unilever PLC [member]    
Disclosure of classes of share capital [line items]    
Number of shares issued 1,460,713,122