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Employees - Staff and Management Costs, Narrative (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Staff And Management Costs [Line Items]
Key management personnel compensation	€ 56	€ 58	€ 41
Executive Director who have left or will leave during the year
Disclosure Of Staff And Management Costs [Line Items]
Key management personnel compensation	€ 11

X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2023-01-01
-Paragraph 17
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2023-en-r&anchor=para_17&doctype=Standard
-URIDate 2023-03-23

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosure Of Staff And Management Costs [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	ul_
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X

- Details

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