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Consolidated Cash Flow Statement (Parenthetical) € in Millions	6 Months Ended
	Jun. 30, 2018 EUR (€)
Blueair [member]
Statement [LineItems]
Non-cash credit from early settlement of contingent consideration	€ 277

X

- 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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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