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Significant Items Within the Income Statement - Summary of Non-underlying Items Related to Gross Profit and Operating Costs (Parenthetical) (Detail) - EUR (€) € in Millions | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Non-underlying Items [Line Items] |  |
Gain from sale of Alsa baking and dessert business | € 60 |
Blueair [member] |  |
Non-underlying Items [Line Items] |  |
Credit from early settlement of contingent consideration |  | € 277
Impairment of intangible asset |  | € 208

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- Definition The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_iv&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Gain on business disposal. + References No definition available. + Details
Name: | ul_GainOnBusinessDisposal
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition non-underlying items. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Non-cash credit from early settlement of contingent consideration. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |