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Employees - Summary of Assets, Liabilities and Surplus/ (Deficit) Position of Pension and Other Post-Employment Benefit Plans at Balance Sheet Date (Detail) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Fair value of assets € 24,023 € 23,749
Other Post-Employment Benefit Plans [Member]    
Disclosure of defined benefit plans [line items]    
Computed net assets/liabilities (438) (470)
Pension asset net of liabilities (438) (470)
Other Post-Employment Benefit Plans [Member] | Aggregate Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Pension asset net of liabilities 1 2
Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Pension asset net of liabilities 1 2
Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Pension asset net of liabilities (32) (20)
Other Post-Employment Benefit Plans [Member] | Unfunded Pension Plans [Member]    
Disclosure of defined benefit plans [line items]    
Pension asset net of liabilities (407) (452)
Assets [Member] | Other Post-Employment Benefit Plans [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 9 14
Assets [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 1 2
Assets [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 8 12
Liabilities [Member] | Other Post-Employment Benefit Plans [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (447) (484)
Liabilities [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (40) (32)
Pension Plans [Member]    
Disclosure of defined benefit plans [line items]    
Computed net assets/liabilities 751 311
Irrecoverable surplus [1] (26) (37)
Pension asset net of liabilities 725 274
Pension Plans [Member] | Aggregate Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Pension asset net of liabilities 2,747 2,457
Pension Plans [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Pension asset net of liabilities 2,721 2,420
Pension Plans [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Pension asset net of liabilities (1,077) (1,137)
Pension Plans [Member] | Unfunded Pension Plans [Member]    
Disclosure of defined benefit plans [line items]    
Pension asset net of liabilities (919) (1,009)
Pension Plans [Member] | Assets [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 24,023 23,749
Pension Plans [Member] | Assets [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 20,790 20,229
Pension Plans [Member] | Assets [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 3,233 3,520
Pension Plans [Member] | Liabilities [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (23,272) (23,438)
Pension Plans [Member] | Liabilities [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (18,043) (17,772)
Pension Plans [Member] | Liabilities [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities € (4,310) € (4,657)
[1] A surplus is deemed recoverable to the extent that the Group can benefit economically from the surplus. Unilever assesses the maximum economic benefit available through a combination of refunds and reductions in future contributions in accordance with local legislation and individual financing arrangements with each of our funded defined benefit plans.