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Consolidated Cash Flow Statement (Parenthetical) € in Millions	12 Months Ended
	Dec. 31, 2018 EUR (€)
Blueair [member]
Statement 1 [Line Items]
Non-cash credit from early settlement of contingent consideration	€ 277

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- Definition

Non-cash credit from early settlement of contingent consideration.

+ References

No definition available.

+ Details

Name:	ul_NoncashCreditFromEarlySettlementOfContingentConsideration
Namespace Prefix:	ul_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	ul_Statement1LineItems
Namespace Prefix:	ul_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ul_BlueairMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: