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Capital and Funding - Summary of Share Capital (Parenthetical) (Detail) - € / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Unilever PLC [member] |  |
Disclosure of classes of share capital [line items] |  |
Conversion rate for ordinary shares nominal value | € 1.121 | € 5.143
Description of conversion of currency | The ordinary share capital of PLC is now translated using the conversion rate at 29 November 2020 of £1 = € 1.121. |
Unilever N.V. [member] |  |
Disclosure of classes of share capital [line items] |  |
Par value per share |  | € 0.16
Ordinary Shares [member] | Unilever PLC [member] |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued | 2,629,243,772 | 1,168,530,650
Cancellation of shares |  | 18,660,634
Ordinary Shares [member] | Unilever N.V. [member] |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued |  | 1,460,714,804
Cancellation of shares |  | 254,012,896
Ordinary Special Shares [member] | Unilever N.V. [member] |  |
Disclosure of classes of share capital [line items] |  |
Par value per share |  | € 428.57
Number of shares issued |  | 2,400
Deferred Stock [Member] | Unilever PLC [member] |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued |  | 100,000
Deferred Stock [Member] | Unilever N.V. [member] |  |
Disclosure of classes of share capital [line items] |  |
Par value per share |  | € 1
Special Shares [Member] | Unilever N.V. [member] |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued |  | 2,400
Shares Issued to NV Shareholders [member] | Unilever PLC [member] |  |
Disclosure of classes of share capital [line items] |  |
Number of shares issued | 1,460,713,122 |

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