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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
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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.

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Irrecoverable surplus. + References No definition available. + Details
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- Details
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