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Trade Payables and Other Liabilities - Summary of Trade Payables and Other Liabilities (Parenthetical) (Detail) - EUR (€) € in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of trade and other payables [Line Items]
Trade payables	€ 9,121	€ 8,217
KKR [member]
Disclosure of trade and other payables [Line Items]
Trade payables	€ 311

X

- Definition

The current amount of payment due to suppliers for goods and services used in entity's business. [Refer: Current liabilities; Trade payables]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2017-01-01
-Paragraph 78
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-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-Paragraph 70
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_70&doctype=Standard
-URIDate 2017-03-09

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disclosure of trade and other payables.

+ References

No definition available.

+ Details

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Namespace Prefix:	ul_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ul_TradeAndOtherCurrentPayablesAxis=ul_KKRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: