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Investment and Return - Additional Information (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of cash and cash equivalents [line items]        
Financial assets measured at fair value through profit or loss reclassified to amortised cost   € 6    
Cash and cash equivalents held by central finance companies € 800      
Percentage of cash and cash equivalents held by central finance companies 26.00%      
Cash and cash equivalents held with foreign subsidiaries € 2,400      
Percentage of cash and cash equivalents held with foreign subsidiaries 74.00%      
Cash and cash equivalents held with foreign subsidiaries for general use by wider business € 154   € 206 € 240
Description of collateral held as security To reduce this risk, Unilever has concentrated its main activities with a limited number of counter-parties which have secure credit ratings. Individual risk limits are set for each counter-party based on financial position, credit rating and past experience. Credit limits and concentration of exposures are actively monitored by the Group’s treasury department. Netting agreements are also put in place with Unilever’s principal counter-parties. In the case of a default, these arrangements would allow Unilever to net assets and liabilities across transactions with that counter-party. To further reduce the Group’s credit exposures on derivative financial instruments, Unilever has collateral agreements with Unilever’s principal counter-parties in relation to derivative financial instruments.      
Collateral held permitted to be sold or repledged in absence of default by owner of collateral, at fair value € 10   6  
IFRS9 [member]        
Disclosure of cash and cash equivalents [line items]        
Equity instruments recogonised at fair value through profit or loss   € 207    
Cash [Member]        
Disclosure of cash and cash equivalents [line items]        
Collateral held permitted to be sold or repledged in absence of default by owner of collateral, at fair value 10   6  
Bond Securities [Member]        
Disclosure of cash and cash equivalents [line items]        
Collateral held permitted to be sold or repledged in absence of default by owner of collateral, at fair value € 0   € 0