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Capital and Funding - Summary of Consolidated Statement of Changes in Equity: Analysis of Other Reserves (Parenthetical) (Detail) | Dec. 31, 2017 € / shares | Dec. 31, 2017 £ / shares | Dec. 31, 2016 € / shares | Dec. 31, 2016 £ / shares | Dec. 31, 2015 € / shares | Dec. 31, 2015 £ / shares
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Unilever N.V. [member] |  |  |  |  |  |
Disclosure of reserves within equity [Line Items] |  |  |  |  |  |
Par value per share | € / shares | € 0.16 |  | € 0.16 |  | € 0.16 |
Unilever PLC [member] |  |  |  |  |  |
Disclosure of reserves within equity [Line Items] |  |  |  |  |  |
Par value per share | £ / shares |  | £ 0.0311 |  | £ 0.0311 |  | £ 0.0311

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