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Events After The Balance Sheet Date - Additional Information (Detail)
€ in Millions
3 Months Ended
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
£ / shares
Dec. 31, 2019
EUR (€)
Disclosure of Non-adjusting Events after Reporting Period [Line Items]      
Dividend declared € 1,125    
Unilever PLC [member]      
Disclosure of Non-adjusting Events after Reporting Period [Line Items]      
Dividend declared € 1,125   € 1,073
Major Ordinary Share Transactions [member] | Unilever PLC [member]      
Disclosure of Non-adjusting Events after Reporting Period [Line Items]      
Dividend payables per share | £ / shares   £ 0.3760