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Remuneration of Auditors - Summary of Services from Auditors and its Associates (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Auditors Remuneration [Line Items] |  |  |
Total statutory audit fees | € 14 | € 14 | € 14
Audit-related assurance services | 0 | 0 | 0
Other taxation advisory services | 0 | 0 | 0
Services relating to corporate finance transactions | 0 | 0 | 0
Other assurance services | 5 |  |
Parent [Member] |  |  |
Disclosure of Auditors Remuneration [Line Items] |  |  |
Total statutory audit fees | 4 | 4 | 5
Subsidiaries [Member] |  |  |
Disclosure of Auditors Remuneration [Line Items] |  |  |
Total statutory audit fees | € 10 | € 10 | € 9

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- Definition The amount of fees paid or payable to the entity's auditors for auditing services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of fees paid or payable to the entity's auditors for tax services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Auditor's remuneration for audit related assurance services. + 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 Auditor's remuneration for finance transactions services. + 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 auditors remuneration. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Other assurance services. + References No definition available. + Details
Name: | ul_OtherAssuranceServices
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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