XML 167 R130.htm IDEA: XBRL DOCUMENT
v3.19.1

Capital and Funding - Summary of Currency Retranslation Reserve (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Movement in foreign currency translation reserve [abstract] |  |
Currency retranslation reserve beginning balance | € (3,927) | € (3,034)
Currency retranslation during the year | (843) | (50)
Movement in net investment hedges and exchange differences in net investments in foreign operations | 77 | (909)
Recycled to income statement | (71) | 66
Currency retranslation reserve ending balance | € (4,764) | € (3,927)

X
- Definition Fair value movements on available for sale investments recycled to income statement group. + References No definition available. + Details
Name: | ul_FairValueMovementsOnAvailableForSaleInvestmentsRecycledToIncomeStatementGroup
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gain (loss) in net investment hedges and exchange differences in net investments in foreign operations. + References No definition available. + Details
Name: | ul_GainLossInNetInvestmentHedgesAndExchangeDifferencesInNetInvestmentsInForeignOperations
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Movement in foreign currency translation reserve. + References No definition available. + Details
Name: | ul_MovementInForeignCurrencyTranslationReserveAbstract
Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reserve of currency retranslation movement. + References No definition available. + Details
Name: | ul_ReserveOfCurrencyRetranslationMovement
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reserve of currency retranslation of group companies. + References No definition available. + Details
Name: | ul_ReserveOfCurrencyRetranslationOfGroupCompanies
Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant