XML 91 R84.htm IDEA: XBRL DOCUMENT v3.8.0.1

Employees - Schedule of Sensitivity of Pension Liabilities to Changes in Weighted Key Assumptions (Detail)	12 Months Ended
	Dec. 31, 2017
Discount Rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in assumption	Increase by 0.5%
Change in liabilities	(7.00%)
Discount Rate [member] | United Kingdom [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in liabilities	(8.00%)
Discount Rate [member] | Netherlands [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in liabilities	(9.00%)
Inflation Rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in assumption	Increase by 0.5%
Change in liabilities	6.00%
Inflation Rate [member] | United Kingdom [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in liabilities	7.00%
Inflation Rate [member] | Netherlands [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in liabilities	9.00%
Life expectancy [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in assumption	Increase by 1 year
Change in liabilities	4.00%
Life expectancy [member] | United Kingdom [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in liabilities	4.00%
Life expectancy [member] | Netherlands [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in liabilities	4.00%
Long-Term Medical Cost Inflation [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in assumption	Increase by 1.0%
Change in liabilities	1.00%
Long-Term Medical Cost Inflation [member] | United Kingdom [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in liabilities	0.00%
Long-Term Medical Cost Inflation [member] | Netherlands [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Change in liabilities	0.00%

X

- Definition

The description of changes in the methods and assumptions used in preparing a sensitivity analysis for significant actuarial assumptions. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2016-01-13
-Paragraph 145
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_145_c&doctype=Standard
-URIDate 2016-03-31

+ Details

Name:	ifrs-full_DescriptionOfChangesInMethodsAndAssumptionsUsedInPreparingSensitivityAnalysisForActuarialAssumptions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Change in pension liabilities as a result of change in life expectancy assumptions.

+ References

No definition available.

+ Details

Name:	ul_PercentageOfChangeInPensionLiabilities
Namespace Prefix:	ul_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfDiscountRatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_NL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfExpectedRatesOfInflationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ul_ActuarialAssumptionOfLifeExpectancyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfMedicalCostTrendRatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: