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Net Finance Cost - Summary of Net Finance Costs (Parenthetical) (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Detailed Information About Finance Income Expense [abstract]
Unwinding of discount	€ (15)	€ (26)
Provision for interest on indirect tax	€ 38	€ 65

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- Definition

Disclosure of detailed information about finance income (expense).

+ References

No definition available.

+ Details

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- Definition

Provision for interest on indirect tax.

+ References

No definition available.

+ Details

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

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- Definition

Unwinding discount on deferred consideration.

+ References

No definition available.

+ Details

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