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Dividends - Summary of Quarterly Dividend Calendar (Detail) | 6 Months Ended
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Jun. 30, 2018
Quarterly dividend for Q2 2018 [member] |
Disclosure of Dividends [Line Items] |
Announcement Date | Jul. 19, 2018
Ex-Dividend Date | Aug. 02, 2018
Record Date | Aug. 03, 2018
Payment Date | Sep. 05, 2018
Quarterly dividend for Q3 2018 [member] |
Disclosure of Dividends [Line Items] |
Announcement Date | Oct. 18, 2018
Ex-Dividend Date | Nov. 01, 2018
Record Date | Nov. 02, 2018
Payment Date | Dec. 05, 2018

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- Definition Disclosure of dividends. + References No definition available. + Details
Name: | ul_DisclosureOfDividendsLineItems
Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Dividend declared date. + References No definition available. + Details
Name: | ul_DividendDeclaredDate
Namespace Prefix: | ul_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Dividend payable date. + References No definition available. + Details
Name: | ul_DividendPayableDate
Namespace Prefix: | ul_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Dividends record date. + References No definition available. + Details
Name: | ul_DividendsRecordDate
Namespace Prefix: | ul_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Ex-dividend date. + References No definition available. + Details
Name: | ul_ExDividendDate
Namespace Prefix: | ul_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ul_DividendAxis=ul_QuarterlyDividendForQ22018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ul_DividendAxis=ul_QuarterlyDividendForQ32018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |