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Related Party Transactions - Additional Information (Detail) - EUR (€) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Joint ventures [Member] | Unilever Jeronimo Martins [Member] |  |
Disclosure of Transactions between Related Parties [Line Items] |  |
Sales revenue | € 117,000,000 | € 118,000,000
Sale to Unilever | 68,000,000 | 66,000,000
Balances owed by/(to) related party | 130,000,000 | 119,000,000
Joint ventures [Member] | Pepsi Lipton [Member] |  |
Disclosure of Transactions between Related Parties [Line Items] |  |
Sales revenue | 65,000,000 | 69,000,000
Sale to Unilever | 65,000,000 | 51,000,000
Balances owed by/(to) related party | (6,000,000) | (4,000,000)
Associates [Member] | Langholm Capital II [Member] |  |
Disclosure of Transactions between Related Parties [Line Items] |  |
Investments in associates | 58,000,000 |
Outstanding commitments made by entity, related party transactions | 17,000,000 | 18,000,000
Amount received back from associate | € 10,000,000 | € 0

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