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Segment Information - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017
Disclosure of operating segments [Abstract] |
Description of revenue from customers | The Unilever Group is not reliant on revenues from transactions with any single customer and does not receive 10% or more of its revenues from transactions with any single customer.
Description of turnover from other countries | No other country had turnover or non-current assets (as shown above) greater than 10% of the Group total.

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- Definition The description of the basis for attributing revenues from external customers to individual countries. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2016-01-13 -Paragraph 33 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2016-03-30&anchor=para_33_a&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Information about the entity's major customers and the extent of the entity's reliance on them. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2016-01-13 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2016-03-30&anchor=para_34&doctype=Standard -URIDate 2016-03-31 + Details
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