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Taxation - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Effective Tax Rate [Abstract]
Effective tax rate	22.70%	22.30%

X

- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2020-01-01

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Effective tax rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	ul_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration