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Events After the Balance Sheet Date | 6 Months Ended
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Jun. 30, 2021
Text Block [Abstract] |
Events After the Balance Sheet Date | 12 EVENTS AFTER THE BALANCE SHEET DATE There were no material post balance sheet events other than those mentioned elsewhere in this report.

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- Definition The entire disclosure for events after the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 10 -IssueDate 2020-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=10&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=IAS10_g17-22_TI -URIDate 2020-01-01 + Details
Name: | ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Text block [abstract] + References No definition available. + Details
Name: | ul_TextBlockAbstract
Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration