XML 172 R135.htm IDEA: XBRL DOCUMENT
v3.19.1

Capital and Funding - Reconciliation of Liabilities Arising from Financing Activities (Parenthetical) (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of financial liabilities [line items] |  |
Cash movement | € (84) | € 8,860
Overdrafts [member] |  |
Disclosure of financial liabilities [line items] |  |
Cash movement | € 2 | € 1

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_DisclosureOfFinancialLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash adjustments in financial liabilities. + References No definition available. + Details
Name: | ul_CashAdjustmentsInFinancialLiabilities
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=ul_OverdraftsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |