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Commitments and Contingent Liabilities - Additional Information (Detail) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of finance lease and operating lease by lessee [abstract] |  |
Future minimum sublease payments under finance lease expected to be received | € 26 | € 29
Future minimum sublease payments under operating lease expected to be received | € 10 | € 12

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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- Definition Expected future minimum sublease payments receivable, classified as finance lease. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Expected future minimum sublease payments receivable, classified as operating lease. + References No definition available. + Details
Name: | ul_ExpectedFutureMinimumSubleasePaymentsReceivableClassifiedAsOperatingLease
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant