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Capital and Funding - Summary of Consolidated Statement of Changes in Equity: Analysis of Other Reserves (Parenthetical) (Detail) - € / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Unilever PLC [member] |  |
Disclosure of reserves within equity [line items] |  |
Conversion rate for ordinary shares nominal value | € 1.121 | € 5.143

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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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Plc share price conversion rate to euro. + References No definition available. + Details
Name: | ul_PLCSharePriceConversionRateToEuro
Namespace Prefix: | ul_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ul_ParentCompaniesOfTheGroupAxis=ul_UnileverPLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |