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Other Non-Current Assets - Movements in Interest in Joint Ventures and Associates (Parenthetical) (Detail) € in Millions | 12 Months Ended
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Dec. 31, 2018 EUR (€)
Unilever FIMA LDA [member] | Joint ventures [member] |
Disclosure Of Joint Ventures And Associates [Line Items] |
Capital reduction in Joint venture | € 64

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- Definition Capital reduction in joint venture. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of joint ventures and associates. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_JointVenturesAxis=ifrs-full_JointVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |