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Investment and Return - Schedule of Cash Resources and Other Financial Assets (Parenthetical) (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial assets [Abstract] |  |
Assets in trust fund benefit obligations | € 63 | € 79

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Period Type: | duration

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- Definition Assets in trust fund benefit obligations. + References No definition available. + Details
Name: | ul_AssetsInTrustFundBenefitObligations
Namespace Prefix: | ul_
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Balance Type: | debit
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