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Capital and Funding - Reconciliation of Liabilities Arising from Financing Activities (Parenthetical) (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial liabilities [Line Items] |  |
Cash movement | € 8,860 | € 1,788
Overdrafts [member] |  |
Disclosure of financial liabilities [Line Items] |  |
Cash movement | € 1 | € 17

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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_
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- Definition Cash adjustments in financial liabilities. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |