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Financial Instruments - 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, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |
Available-for-sale financial assets |  | € 564 | € 655
Financial assets at fair value through other comprehensive income | € 288 |  |
Level 1 [member] |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |
Available-for-sale financial assets |  | 215 | 277
Financial assets at fair value through other comprehensive income | 143 |  |
Financial assets at fair value through profit or loss: |  |  |
Other | 185 | 137 |
Level 2 [member] |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |
Available-for-sale financial assets |  | 7 | 8
Financial assets at fair value through other comprehensive income | 4 |  |
Financial assets at fair value through profit or loss: |  |  |
Derivatives | 366 | 173 | 376
Other |  |  | 104
Liabilities at fair value |  |  |
Derivatives | (588) | (534) | (392)
Level 3 [member] |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |
Available-for-sale financial assets |  | 342 | 370
Financial assets at fair value through other comprehensive income | 141 |  |
Financial assets at fair value through profit or loss: |  |  |
Other | 194 | 2 | 2
Liabilities at fair value |  |  |
Contingent Consideration | € (199) | € (445) | € (413)

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