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Capital and funding - Narrative (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]    
Number of shares acquired 62,976,145 0
Number of shares held by employee share ownership trust   5,884,511
Number of ordinary shares held by other group companies in connection with share-based compensation plans 847,914  
Unilever PLC    
Disclosure of classes of share capital [line items]    
Number of treasury shares held   7,266,666
Number of shares held by employee share ownership trust 4,453,244