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Capital and Funding - Summary of Consolidated Statement of Changes in Equity: Analysis of Other Reserves (Parenthetical) (Detail) - € / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Unilever PLC [member]
Disclosure of reserves within equity [line items]
Conversion rate for ordinary shares nominal value	€ 1.121	€ 5.143

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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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- Definition

Plc share price conversion rate to euro.

+ References

No definition available.

+ Details

Name:	ul_PLCSharePriceConversionRateToEuro
Namespace Prefix:	ul_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	ul_ParentCompaniesOfTheGroupAxis=ul_UnileverPLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: