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Assets and Liabilities Held for Sale - Additional Information (Detail) € in Millions | 6 Months Ended
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Jun. 30, 2021 EUR (€)
Disposal Groups Held for Sale [member] |
Non-current Assets Held for Sale [Line Items] |
Estimated exchange gain disposal of an asset or disposal group | € 55

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- Definition The net gain arising from foreign exchange differences. [Refer: Foreign exchange gain (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 21 -IssueDate 2020-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2020-en-r&anchor=para_52_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_NetForeignExchangeGain
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Non-current Assets Held for Sale [Line Items] + References No definition available. + Details
Name: | ul_NoncurrentAssetsHeldForSaleLineItems
Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis=ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |