XML 325 R175.htm IDEA: XBRL DOCUMENT v3.20.4

Related Party Transactions - Additional Information (Detail) - Langholm Capital II [Member] - Associates [member] - EUR (€) € in Millions	12 Months Ended
	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

X

- 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

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

X

- 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

Name:	ifrs-full_OutstandingCommitmentsMadeByEntityRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount received back from associate

+ References

No definition available.

+ Details

Name:	ul_AmountReceivedBackFromAssociate
Namespace Prefix:	ul_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ul_LangholmCapitalIIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=ifrs-full_AssociatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: