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Inventories - Summary Reconciliation Of Provision For Inventories (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Reconciliation Of Provision For Inventories [Line Items] |  |  |
Provisions for inventories beginning balance |  | € 288 | € 205
Charge to income statement |  | 116 | 153
Reduction/releases |  | (97) | (71)
Currency translations |  | (26) |
Others | [1] | 3 | 1
Provisions for inventories ending balance |  | € 284 | € 288
[1] | Others include the amount relating to the acquisition/disposal of businesses.

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- Definition Currency translations on provision for inventories. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of reconciliation of provision for inventories. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Other movements on provision for inventories. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Provision for inventories charge to income statement. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Reconciliation​ of provision​ for ​inventories​. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Reduction or release of provision for inventories. + References No definition available. + Details
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Namespace Prefix: | ul_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration