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Capital and Funding - Summary of Financial Liabilities (Parenthetical) (Detail) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of financial liabilities [abstract] |  |
Secured liabilities | € 2.6 | € 0.0

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