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Capital and funding - Additional Information (Detail) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Unilever PLC [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares acquired | 53,359,284 | 2,268,600
Number of treasury shares held | 84,463,561 | 33,241,009
Unilever PLC [member] | Share based compensation [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Number of treasury shares held | 6,074,283 |
Unilever PLC [member] | Deferred stock [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Dividend per annum | 6.00% | 6.00%
Unilever N.V. [member] | Ordinary Shares [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares acquired | 53,003,099 | 3,902,584
Number of treasury shares held | 201,538,909 | 151,953,411
Unilever N.V. [member] | Ordinary Shares [member] | Share based compensation [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Number of treasury shares held | 9,728,181 |

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- Definition The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 79 -Subparagraph a -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_79_a_vi&doctype=Standard -URIDate 2016-03-31 + Details
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