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Property, Plant and Equipment - Summary of Detailed Information About Lease And Own Assets (Details) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment [abstract]
Property, plant and equipment	€ 10,347	€ 10,558
Owned assets
Property, plant and equipment [abstract]
Property, plant and equipment	8,833	8,909
Lease assets
Property, plant and equipment [abstract]
Property, plant and equipment	€ 1,514	€ 1,649

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- Definition

The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2021-01-01
-Paragraph 73
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 54
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_a&doctype=Standard
-URIDate 2021-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ul_OwnedAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ul_AssetsUnderLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: