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Assets and Liabilities Held for Sale - Additional Information (Detail) € in Millions	6 Months Ended
	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

X

- 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

X

- 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

X

- Details

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