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Provisions - Additional Information (Detail) - Payments in relation to legal cases [member] € in Millions	12 Months Ended
	Dec. 31, 2018 EUR (€)
Disclosure of Provisions [Line Items]
Legal claims paid for investigations by national competition authorities	€ 104
Legal claims paid for investigations by national competition authorities from prior year provision	€ 76

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- Definition

Disclosure of provisions line items.

+ References

No definition available.

+ Details

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Namespace Prefix:	ul_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Legal claims paid in current year out of previous year provision.

+ References

No definition available.

+ Details

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

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- Definition

Legal settlement claim paid.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: