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Capital and funding - Additional Information (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of classes of share capital [line items] |  |
Number of shares cancelled | 122,965,077 |
Unilever N.V. [member] | Ordinary Shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Number of shares acquired | 66,202,168 | 53,003,099
Number of treasury shares held | 263,349,111 | 201,538,909
Unilever N.V. [member] | Ordinary Shares [member] | Share Based Compensation [Member] |  |
Disclosure of classes of share capital [line items] |  |
Number of treasury shares held | 9,336,215 |
Unilever PLC [member] |  |
Disclosure of classes of share capital [line items] |  |
Nominal dividend paid on the deferred stock of PLC | 6.00% |
Number of shares acquired | 65,458,433 | 53,359,284
Number of treasury shares held | 24,334,848 | 84,463,561
Number of shares cancelled | 122,965,077 |
Unilever PLC [member] | Share Based Compensation [Member] |  |
Disclosure of classes of share capital [line items] |  |
Number of treasury shares held | 5,674,214 |

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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 2017-01-01 -Paragraph 79 -Subparagraph a -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_vi&doctype=Standard -URIDate 2017-03-09 + Details
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