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Earnings per share - Summary of Movements in Shares (Details) shares in Millions | 6 Months Ended
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Jun. 30, 2024 shares
Reconciliation of number of shares outstanding [abstract] |
Number of shares outstanding at beginning of period (in shares) | 2,499.0
Shares repurchased under the share buyback programme (in shares) | (7.3)
Net movements in shares under incentive schemes (in shares) | 3.7
Number of shares outstanding at end of period (in shares) | 2,495.4

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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration

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- Definition Decrease In The Number Of Shares Outstanding On Account Of Shares Repurchased. + References No definition available. + Details
Name: | ul_DecreaseInTheNumberOfSharesOutstandingOnAccountOfSharesRepurchased
Namespace Prefix: | ul_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase (decrease) in number of shares outstanding through share-based payment transactions. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration