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Capital and funding - Summary of Share Capital (Details) - Unilever PLC
€ / shares in Units, £ / shares in Units, € in Millions, £ in Millions
 1 Months Ended 11 Months Ended
Dec. 31, 2020
GBP (£)
£ / shares
shares
Nov. 28, 2020
£ / shares
Nov. 28, 2020
€ / shares
Dec. 31, 2021
GBP (£)
shares
Dec. 31, 2021
EUR (€)
shares
Dec. 31, 2020
EUR (€)
shares
Disclosure of classes of share capital [line items]            
Issued, called up and fully paid £ 81.8     £ 81.8 € 92 € 92
Conversion rate for ordinary shares nominal value | (per share) £ 1 £ 1 € 1.121      
PLC ordinary shares of 31/9 p each(a)            
Disclosure of classes of share capital [line items]            
Issued, called up and fully paid | £ £ 36.4     £ 81.8    
Number of shares issued | shares 2,629,243,772     2,629,243,772 2,629,243,772 2,629,243,772
Shares issued to NV Shareholders            
Disclosure of classes of share capital [line items]            
Issued, called up and fully paid | £ £ 45.4     £ 0.0    
Number of shares issued | shares 1,460,713,122         1,460,713,122