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Capital and funding - Narrative (Details) - shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [line items]    
Number of shares acquired (in shares) 31,734,256 34,217,605
Number of ordinary shares held by employee share ownership trust (in shares) 1,361,032  
Number of ordinary shares held by other group companies in connection with share-based compensation plans (in shares) 36,903  
Unilever PLC    
Disclosure of classes of share capital [line items]    
Number of treasury shares held (in shares)   3,054,400
Unilever PLC | PLC ordinary shares    
Disclosure of classes of share capital [line items]    
Number of treasury shares cancelled (in shares) 112,746,434