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Related Party Transactions - Summary of Related Party Balances Existed with Associate or Joint Venture Businesses (Detail) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Joint Ventures Where Entity is Venturer [Member] |  |
Disclosure of Transactions between Related Parties [Line Items] |  |
Trading and other balances due from joint ventures | € 121 | € 124
Associates [member] |  |
Disclosure of Transactions between Related Parties [Line Items] |  |
Trading and other balances due from/(to) associates | € 0 | € 0

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- Definition The amounts receivable resulting from related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_20&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_18_b&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amounts receivable payable related party transactions. + References No definition available. + Details
Name: | ul_AmountsReceivablePayableRelatedPartyTransactions
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_JointVenturesWhereEntityIsVenturerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_AssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |