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Significant Items Within the Income Statement - Summary of Non-underlying Items Related to Gross Profit and Operating Costs (Detail) - EUR (€) € in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Disclosure of non underlying items [Abstract] |  |
Acquisition and disposal-related credit/(costs | € 148 | € (69)
Gain/(loss) on disposal of group companies |  | 308
Restructuring costs | (367) | (318)
Impairment and other one-off items | (219) |
Non-underlying items within operating profit before tax | (438) | (79)
Tax on non-underlying items within operating profit | 170 | (21)
Non-underlying items within operating profit after tax | (268) | (100)
Non-underlying items not in operating profit but within net profit: |  |
Impact of US tax reform | (29) |
Non-underlying items not in operating profit but within net profit after tax | (29) |
Non-underlying items after tax | (297) | (100)
Attributable to: |  |
Non-controlling interests | (10) | (4)
Shareholders' equity | € (287) | € (96)

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- Definition The amount of expense relating to restructuring. Restructuring is a programme that is planned and controlled by management and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. Such programmes include: (a) the sale or termination of a line of business; (b) closure of business locations in a country or region or the relocation of activities from one country or region to another; (c) changes in management structure; and (d) fundamental reorganisations that have a material effect on the nature and focus of the entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_b&doctype=Standard -URIDate 2017-03-09 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Acquisition and disposal-related costs. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of non-underlying items. + References No definition available. + Details
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- Definition Gain (loss) on disposal of group companies. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Impairments and other one-off items. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Income (expense) non-underlying items not in operating profit but within net profit after tax. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Income (expense) non-underlying items within operating profit after tax. + References No definition available. + Details
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- Definition Income (expense) non-underlying items with in operating profit before tax. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Non underlying charges and credits after tax, attributable to. + References No definition available. + Details
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- Definition Non-underlying income or (expense) after tax. + References No definition available. + Details
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- Definition Total non-underlying income or expense after tax attributable to non-controlling interest. + References No definition available. + Details
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- Definition Total non-underlying income or expense after tax attributable to Parent. + References No definition available. + Details
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- Definition Nonunderlying Items Not In Operating Profit But Within Net Profit [abstract] + References No definition available. + Details
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- Definition Tax charge (credit) on non-underlying items within operating profit. + References No definition available. + Details
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- Definition Tax expense (benefit) due to change in USA tax rates. + References No definition available. + Details
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