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Acquisitions and Disposals - Summary of Business Acquisitions and Disposals (Detail) | 12 Months Ended |  |
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Dec. 31, 2017 | Dec. 31, 2016 | Nov. 01, 2017 | Aug. 01, 2017
Living Proof [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Feb. 01, 2017 |  |  |
Acquired/disposed business | Acquired Living Proof, an innovative premium hair care business, using patented technology and breakthrough science. Living Proof forms part of our prestige Personal Care business. |  |  |
AdeS Soy Beverage Business [member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Mar. 28, 2017 |  |  |
Acquired/disposed business | Sold the AdeS so beverage business in Latin America to Coca-Cola FEMSA and The Coca-Cola Company |  |  |
Kensington's [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | May 01, 2017 |  |  |
Acquired/disposed business | Acquired Kensington's, a condiment maker. Kensington's is a mission-driven company with a leading brand sold in the organic and naturals marketplace. |  |  |
EAC Myanmar [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Acquisition percentage |  |  |  | 60.00%
Deal completion date | Aug. 01, 2017 |  |  |
Acquired/disposed business | Acquired 60% of EAC Myanmar, a home care business to form Unilever EAC Myanmar Company Limited. |  |  |
Hourglass [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Aug. 01, 2017 |  |  |
Acquired/disposed business | Acquired Hourglass, a luxury colour cosmetics business, known for innovation and exceptional product. Hourglass forms part of our prestige Personal Care business. |  |  |
Pukka herbs [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Sep. 07, 2017 |  |  |
Acquired/disposed business | Acquired Pukka Herbs, an organic herbal tea business, that enhances our presence in the Naturals segment of Refreshment. |  |  |
Weis [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Sep. 09, 2017 |  |  |
Acquired/disposed business | Acquired Weis, an ice cream business. Weis is a second-generation Australian ice cream and frozen dessert manufacturer with the original iconic Fruito Bar and aims to increase our market position in Refreshment. |  |  |
Carver Korea [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Acquisition percentage |  |  | 98.00% |
Deal completion date | Nov. 01, 2017 |  |  |
Acquired/disposed business | Acquired 98% of Carver Korea, a leading skincare business in North Asia from Bain Capital Private Equity and Goldman Sachs. The brands acquired provide Unilever a presence in South Korea. Further details are provided below. |  |  |
Mae terra [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Dec. 01, 2017 |  |  |
Acquired/disposed business | Acquired Mae Terra, a Brazilian naturals and organic food business. Mãe Terra is a fast-growing and well-loved brand in Brazil and adds to the Foods business by providing health-conscious consumers with organic and nutritious food products. |  |  |
TAZO [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Dec. 11, 2017 |  |  |
Acquired/disposed business | Acquired TAZO, the leading brand in the speciality tea category, which enhances our presence in the Black, Green and Herbal tea segments of Refreshment. |  |  |
Sundial brands [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Dec. 18, 2017 |  |  |
Acquired/disposed business | Acquired Sundial Brands, a leading haircare and skincare company recognised for its innovative use of high-quality and culturally authentic ingredients. |  |  |
Schmidt's Naturals[Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date | Dec. 31, 2017 |  |  |
Acquired/disposed business | Acquired Schmidt's Naturals, a personal care company. Schmidt's Naturals is a strong, innovative brand in the fast-growing naturals category, that will complement our existing portfolio of US deodorants. |  |  |
Modern [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date |  | Mar. 31, 2016 |  |
Acquired/disposed business |  | Sold the bread and bakery business under the brand 'Modern' in India to Nimman Foods Private Limited, part of the Everstone Group. |  |
Indulekha and Vayodha Brand [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date |  | Apr. 07, 2016 |  |
Acquired/disposed business |  | Acquired Indulekha and Vayodha brands from Mosons Group. |  |
Alberto Culver Brands and Manufacturing Plant [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date |  | May 06, 2016 |  |
Acquired/disposed business |  | Sold local Alberto Culver brands Antiall, Farmaco, Veritas, the rights for VO5 in Argentina and a manufacturing plant to Santiago Saenz. |  |
Rice Exports Business In India [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date |  | Jul. 31, 2016 |  |
Acquired/disposed business |  | Sold the Rice Exports business in India to LT Foods Middle East DMCC, a Group company of LT Foods Limited. |  |
Dollar Shave Club [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date |  | Aug. 10, 2016 |  |
Acquired/disposed business |  | Acquired Dollar Shave Club, a subscription-based direct-to-consumer male grooming business. |  |
Seventh Generation [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date |  | Oct. 20, 2016 |  |
Acquired/disposed business |  | Acquired Seventh Generation, a North American home and personal care eco-friendly naturals business. |  |
Blueair [Member] |  |  |  |
Disclosure of Acquisitions and Disposals [Line Items] |  |  |  |
Deal completion date |  | Dec. 01, 2016 |  |
Acquired/disposed business |  | Acquired Blueair, a supplier of innovative mobile indoor air purification technologies and solutions |  |

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