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Capital and Funding - Summary of Financial Liabilities (Parenthetical) (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of financial liabilities [Abstract] |  |
Secured liabilities | € 1 | € 2

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Secured liabilities. + References No definition available. + Details
Name: | ul_SecuredLiabilities
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant