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Employees - Summary of Assumptions, Weighted by Liabilities for Valuation of Defined Benefit Plans (Details)	Dec. 31, 2022	Dec. 31, 2021
Pension plans
Disclosure of defined benefit plans [line items]
Discount rate	4.60%	1.80%
Inflation	2.80%	2.60%
Rate of increase in salaries	3.30%	3.20%
Rate of increase for pensions in payment (where provided)	2.40%	2.50%
Rate of increase for pensions in deferment (where provided)	2.60%	2.70%
Other post- employment benefit plans
Disclosure of defined benefit plans [line items]
Discount rate	5.90%	3.60%
Rate of increase in salaries	3.00%	3.00%
Long-term medical cost inflation	5.10%	5.10%

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 2021-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard
-URIDate 2021-03-24

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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 2021-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard
-URIDate 2021-03-24

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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 2021-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard
-URIDate 2021-03-24

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- 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.

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- Definition

Actuarial Assumption Of Increase For Pensions In Deferment Where Provided

+ References

No definition available.

+ Details

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- Definition

Actuarial assumption of increase for pensions in payment where provided.

+ References

No definition available.

+ Details

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Namespace Prefix:	ul_
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- Definition

Actuarial assumption of long term medical cost inflation.

+ References

No definition available.

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- Details

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X

- Details

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