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Commitments and Contingent Liabilities - Additional Information (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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 | € 29 | € 31
Future minimum sublease payments under operating lease expected to be received | € 12 | € 17

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