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Provisions - Additional Information (Detail) - Payments in relation to legal cases [member] € in Millions | 12 Months Ended
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Dec. 31, 2018 EUR (€)
Disclosure of Provisions [Line Items] |
Legal claims paid for investigations by national competition authorities | € 104
Legal claims paid for investigations by national competition authorities from prior year provision | € 76

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- Definition Disclosure of provisions line items. + References No definition available. + Details
Name: | ul_DisclosureOfProvisionsLineItems
Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Legal claims paid in current year out of previous year provision. + References No definition available. + Details
Name: | ul_LegalClaimsPaidInCurrentYearOutOfPreviousYearProvision
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Legal settlement claim paid. + References No definition available. + Details
Name: | ul_LegalSettlementClaimPaid
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=ul_PaymentsInRelationToLegalCasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |