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v3.19.2

Taxation - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Effective tax rate [abstract] |  |
Effective tax rate | 26.80% | 25.90%

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- 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 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Effective tax rate. + References No definition available. + Details
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Namespace Prefix: | ul_
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Balance Type: | na
Period Type: | duration