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Capital and Funding - Summary of Share Capital (Parenthetical) (Detail) | 12 Months Ended |  |  |
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Dec. 31, 2017 € / shares shares | Dec. 31, 2017 £ / shares shares | Dec. 31, 2016 € / shares shares | Dec. 31, 2016 £ / shares shares | Dec. 31, 2015 € / shares | Dec. 31, 2015 £ / shares
Unilever N.V. [member] |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Par value per share | € / shares | € 0.16 |  | € 0.16 |  | € 0.16 |
Number of authorised shares | 3,000,000,000 | 3,000,000,000 | 3,000,000,000 | 3,000,000,000 |  |
Unilever PLC [member] |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Par value per share | £ / shares |  | £ 0.0311 |  | £ 0.0311 |  | £ 0.0311
Conversion rate for ordinary shares nominal value | € / shares | € 5.143 |  |  |  |  |
Description of conversion of currency | Conversion rate for PLC ordinary shares nominal value to euros is 1 €5.143 (which is calculated by dividing the nominal value of NV ordinary shares by the nominal value of PLC ordinary shares). |  |  |  |  |
Ordinary Shares [member] | Unilever N.V. [member] |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Par value per share | € / shares | € 0.16 |  | € 0.16 |  |  |
Number of shares issued | 1,714,727,700 | 1,714,727,700 | 1,714,727,700 | 1,714,727,700 |  |
Ordinary Shares [member] | Unilever PLC [member] |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Par value per share | £ / shares |  | £ 0.031 |  | £ 0.031 |  |
Number of shares issued | 1,310,156,361 | 1,310,156,361 | 1,310,156,361 | 1,310,156,361 |  |
Special shares [Member] | Unilever N.V. [member] |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Number of shares issued | 2,400 | 2,400 | 2,400 | 2,400 |  |
Deferred stock [member] | Unilever PLC [member] |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Par value per share | £ / shares |  | £ 1 |  | £ 1 |  |
Number of shares issued | 100,000 | 100,000 | 100,000 | 100,000 |  |
Ordinary Special Shares [Member] | Unilever N.V. [member] |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Par value per share | € / shares | € 428.57 |  | € 428.57 |  |  |

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