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Consolidated Statement of Changes in Equity (Parenthetical) € in Millions, £ in Millions	6 Months Ended
	Jun. 30, 2021 EUR (€)	Jun. 30, 2020 EUR (€)
Hyperinflation Adjustment	€ 137
Unilever Malaysia [member]
Premium paid for purchase of non-controlling interest		€ 163
Welly Acquisition [Member]
Other Movement In Equity	€ 83

X

- Definition

Hyperinflation adjustment.

+ References

No definition available.

+ Details

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

X

- Definition

Other movement in equity

+ References

No definition available.

+ Details

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

X

- Definition

Premium paid for purchase of non-controlling interest.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ul_WellyAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: