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Events After The Balance Sheet Date - Additional Information (Detail) € / shares in Units, € in Millions | Feb. 05, 2018 EUR (€) | Feb. 01, 2018 € / shares | Feb. 01, 2018 £ / shares | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€)
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Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Bond issued |  |  |  | € 22,709 | € 15,053
Entering into significant commitments or contingent liabilities [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Bond issued | € 2,000 |  |  |  |
Entering into significant commitments or contingent liabilities [Member] | 0.5% Bonds due August 2023 [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Bond issued | € 500 |  |  |  |
Maturity period | August 2023 |  |  |  |
Entering into significant commitments or contingent liabilities [Member] | 0.5% Bonds due August 2023 [Member] | Fixed interest rate [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Fixed rate | 0.50% |  |  |  |
Entering into significant commitments or contingent liabilities [Member] | 1.125% Bonds due February 2027 [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Bond issued | € 700 |  |  |  |
Maturity period | February 2027 |  |  |  |
Entering into significant commitments or contingent liabilities [Member] | 1.125% Bonds due February 2027 [Member] | Fixed interest rate [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Fixed rate | 1.125% |  |  |  |
Entering into significant commitments or contingent liabilities [Member] | 1.625% Bonds due February 2033 [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Bond issued | € 800 |  |  |  |
Maturity period | February 2033 |  |  |  |
Entering into significant commitments or contingent liabilities [Member] | 1.625% Bonds due February 2033 [Member] | Fixed interest rate [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Fixed rate | 1.625% |  |  |  |
Unilever N.V. [member] | Major Ordinary Share Transactions [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Dividend payables per share | € / shares |  | € 0.3585 |  |  |
Unilever PLC [member] | Major Ordinary Share Transactions [Member] |  |  |  |  |
Disclosure of Non-adjusting Events after Reporting Period [Line Items] |  |  |  |  |
Dividend payables per share | £ / shares |  |  | £ 0.3155 |  |

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