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Related Party Transactions - Additional Information (Detail) - Langholm Capital II [Member] - Associates [member] - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Transactions between Related Parties [Line Items] |  |
Investments in associates |  | € 64
Outstanding commitments made by entity, related party transactions | € 2 | 11
Amount received back from associate | € 0 | € 0

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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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Balance Type: | na
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- Definition The amount of outstanding commitments made by the entity in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_18_b&doctype=Standard -URIDate 2020-01-01 + Details
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Period Type: | instant

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- Definition Amount received back from associate + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Gross investments in associates. + References No definition available. + Details
Name: | ul_GrossInvestmentsInAssociates
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Data Type: | na
Balance Type: |
Period Type: |