The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph f
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Definition

The amount of employer contributions to retirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2024-01-01
-Paragraph 35
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2024-en-r&anchor=para_35_b_i&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_EmployerContributions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash flow in respect of pensions and similar benefits.

+ References

No definition available.

+ Details

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

- Definition

Increase (Decrease) In Net Defined Benefit Liability (Asset) Resulting From Partial Refund

+ References

No definition available.

+ Details

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

- Details

Name:	srt_StatementScenarioAxis=ul_FutureEstimateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_NetDefinedBenefitLiabilityAssetAxis=ul_FundedPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_NL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_NetDefinedBenefitLiabilityAssetAxis=ul_UnfundedPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employees - Schedule of Cash Flow in Respect of Pensions and Similar Post-Employment Benefits (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 EUR (€)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 EUR (€)
Disclosure of defined benefit plans [line items]
Group cash flow in respect of pensions and similar benefits		€ 427	€ 629		€ 515
Future Estimate
Disclosure of defined benefit plans [line items]
Group cash flow in respect of pensions and similar benefits	€ 450
Company contributions to funded plans
Disclosure of defined benefit plans [line items]
Defined Benefit		82	291		176
Defined Contribution		230	222		212
Company contributions to funded plans \| United States
Disclosure of defined benefit plans [line items]
Defined Benefit \| $				$ 110
Company contributions to funded plans \| The Netherlands
Disclosure of defined benefit plans [line items]
Refund from plan		115
Company contributions to funded plans \| Future Estimate
Disclosure of defined benefit plans [line items]
Defined Benefit	95
Defined Contribution	245
Company contributions to funded plans \| Future Estimate \| The Netherlands
Disclosure of defined benefit plans [line items]
Refund from plan	118
Company contributions to funded plans \| Future Estimate \| United Kingdom
Disclosure of defined benefit plans [line items]
Defined Benefit	0
Benefit paid by the Company in respect of unfunded plans
Disclosure of defined benefit plans [line items]
Defined Benefit		€ 115	€ 116		€ 127
Benefit paid by the Company in respect of unfunded plans \| Future Estimate
Disclosure of defined benefit plans [line items]
Defined Benefit	€ 110