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Capital and Funding - Summary of Share Capital (Parenthetical) (Detail) | 12 Months Ended |  |  |
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Dec. 31, 2018 € / shares shares | Dec. 31, 2018 £ / shares shares | Dec. 31, 2017 € / shares shares | Dec. 31, 2017 £ / shares shares | Dec. 31, 2016 € / shares | Dec. 31, 2016 £ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Cancellation of shares | 122,965,077 |  |  |  |  |
Treasury shares | 24,334,848 | 24,334,848 |  |  |  |
Unilever PLC [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Par value per share | £ / shares |  | £ 0.0311 |  | £ 0.0311 |  | £ 0.0311
Cancellation of shares | 122,965,077 |  |  |  |  |
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). |  |  |  |  |
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 |  |
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 | 1,187,191,284 | 1,187,191,284 | 1,310,156,361 | 1,310,156,361 |  |
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 Special Shares [member] | Unilever N.V. [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Par value per share | € / shares | € 428.57 |  | € 428.57 |  |  |
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 |  |
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 |  |

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