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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
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Jun. 30, 2021 | Jun. 30, 2020
Disclosure of non underlying items [Abstract] |  |  |
Acquisition and disposal-related credit/(costs) |  | € (122) | € (27)
Gain/(loss) on disposal of group companies |  | 7 | 6
Restructuring costs |  | (306) | (391)
Non-underlying items within operating profit before tax |  | (421) | (412)
Tax on non-underlying items within operating profit |  | 97 | 109
Non-underlying items within operating profit after tax |  | (324) | (303)
Net monetary gain/(loss) arising from hyperinflationary economies |  | (29) | 21
Non-underlying items not in operating profit but within net profit before tax |  | (29) | 21
Tax impact of non-underlying items not in operating profit but within net profit: |  |  |
Taxes related to the UK tax audit of intangible income and centralised services |  | (6) |
Hyperinflation adjustment for Argentina deferred tax |  | (28) | (7)
Non-underlying items not in operating profit but within net profit after tax |  | (63) | 14
Non-underlying items after tax | [1] | (387) | (289)
Attributable to: |  |  |
Non-controlling interests |  | (20) | (14)
Shareholders' equity |  | € (367) | € (275)
[1] | Non-underlying items after tax is calculated as non-underlying items within operating profit after tax plus non-underlying items not in operating profit but within net profit after tax.

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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 2020-01-01 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_b&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The gains (losses) representing the difference resulting from the restatement of non-monetary assets, owners' equity and items in the statement of comprehensive income and the adjustment of index linked assets and liabilities in hyperinflationary reporting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 29 -IssueDate 2020-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=29&code=ifrs-tx-2020-en-r&anchor=para_9&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Acquisition and disposal related costs. + 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 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 Hyperinflationary adjustment for deferred tax. + References No definition available. + Details
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Balance Type: | debit
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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
Balance Type: | credit
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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- 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 Non underlying items not in operating profit but within net profit before tax. + References No definition available. + Details
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- 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 Taxes charges related to the UK tax audit of intangible income and centralised services + References No definition available. + Details
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