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Capital and Funding - Reconciliation of Liabilities Arising from Financing Activities (Parenthetical) (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial liabilities [line items]
Cash movement	€ (84)	€ 8,860
Overdrafts [member]
Disclosure of financial liabilities [line items]
Cash movement	€ 2	€ 1

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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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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	duration

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- Definition

Cash adjustments in financial liabilities.

+ References

No definition available.

+ Details

Name:	ul_CashAdjustmentsInFinancialLiabilities
Namespace Prefix:	ul_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

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