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Purchase of Preference Shares - Additional Information (Detail) - 6% and 7% Cumulative Preference Shares [Member] € in Millions | 12 Months Ended
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Dec. 31, 2017 EUR (€)
Disclosure of Purchase of Preference Shares [Line Items] |
Percentage of preference shares tendered | 99.00%
Consideration paid for the repurchase of shares | € 448
Liability recorded in other financial liabilities | € 2
Percentage of preference shares for which liability is recorded | 1.00%
Difference between consideration paid and carrying value of shares | € 382

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- Definition Consideration paid for repurchase of preference shares. + References No definition available. + Details
Name: | ul_ConsiderationPaidForRepurchaseOfPreferenceShares
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Difference between consideration paid and carrying value of preference shares. + References No definition available. + Details
Name: | ul_DifferenceBetweenConsiderationPaidAndCarryingValueOfPreferenceShares
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of Purchase of Preference Shares [Line Items] + References No definition available. + Details
Name: | ul_DisclosureOfPurchaseOfPreferenceSharesLineItems
Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Financial liability in connection with purchase of preference shares. + References No definition available. + Details
Name: | ul_FinancialLiabilityInConnectionWithPurchaseOfPreferenceShares
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage of preference shares for which liability is recorded. + References No definition available. + Details
Name: | ul_PercentageOfPreferenceSharesForWhichLiabilityIsRecorded
Namespace Prefix: | ul_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of preference shares tendered. + References No definition available. + Details
Name: | ul_PercentageOfPreferenceSharesTendered
Namespace Prefix: | ul_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ul_SixPercentAndSevenPercentPreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |