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Employees - Summary of Assumptions, Weighted by Liabilities for Valuation of Defined Benefit Plans Which cover Approximately 00% of Total Pension Plan (Detail)	Dec. 31, 2020	Dec. 31, 2019
Defined benefit pension plans [Member]
Disclosure of defined benefit plans [line items]
Discount rate	1.30%	1.90%
Inflation	2.20%	2.30%
Rate of increase in salaries	2.90%	2.90%
Rate of increase for pensions in payment (where provided)	2.10%	2.20%
Rate of increase for pensions in deferment (where provided)	2.30%	2.40%
Other Post-Employment Benefit Plans [Member]
Disclosure of defined benefit plans [line items]
Discount rate	3.30%	3.90%
Rate of increase in salaries	3.00%	3.00%
Long-term medical cost inflation	5.10%	5.40%

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	instant

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

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

X

- Definition

Actuarial assumption of increase for pensions in deferment where provided

+ References

No definition available.

+ Details

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Namespace Prefix:	ul_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Actuarial assumption of increase for pensions in payment where provided.

+ References

No definition available.

+ Details

Name:	ul_ActuarialAssumptionOfIncreaseForPensionsInPaymentWhereProvided
Namespace Prefix:	ul_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Actuarial assumption of long term medical cost inflation.

+ References

No definition available.

+ Details

Name:	ul_ActuarialAssumptionOfLongTermMedicalCostInflation
Namespace Prefix:	ul_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ul_RetirementBenefitPlansTypeAxis=ul_OtherPostEmploymentBenefitPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: