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Financial Instruments Fair Value Risk - Summary of Assets and Liabilities Carried at Fair Value, Classification of Fair Value Calculations by Category (Detail) - Fair value [member] - EUR (€) € in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |  |
Financial assets at fair value through other comprehensive income | € 327 | € 329 | [1] | € 288 | [1]
Level 1 [member] |  |  |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |  |
Financial assets at fair value through other comprehensive income | 116 | 160 |  | 143 |
Financial assets at fair value through profit or loss: |  |  |  |  |
Other | 155 | 145 |  | 185 |
Level 2 [member] |  |  |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |  |
Financial assets at fair value through other comprehensive income | 4 | 5 |  | 4 |
Financial assets at fair value through profit or loss: |  |  |  |  |
Derivatives | 448 | 276 |  | 366 |
Liabilities at fair value |  |  |  |  |
Derivatives | (530) | (542) |  | (588) |
Level 3 [member] |  |  |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |  |
Financial assets at fair value through other comprehensive income | 207 | 164 |  | 141 |
Financial assets at fair value through profit or loss: |  |  |  |  |
Other | 226 | 219 |  | 194 |
Liabilities at fair value |  |  |  |  |
Contingent Consideration | € (156) | € (142) |  | € (199) |
[1] | Restated following adoption of IFRS 16. Refer note 1 and note 9.

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