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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) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Other cash equivalents | € 80 | € 90
Available-for-sale financial assets | 564 | 509
Financial assets at fair value through profit or loss: |  |
Other | 1,445 | 1,272
Fair value [Member] |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Other cash equivalents | 80 | 90
Available-for-sale financial assets | 564 | 509
Financial assets at fair value through profit or loss: |  |
Derivatives | 173 | 226
Other | 139 | 132
Derivatives | (534) | (331)
Contingent consideration | (445) | (380)
Fair value [Member] | Level 1 [Member] |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Available-for-sale financial assets | 215 | 138
Financial assets at fair value through profit or loss: |  |
Other | 137 |
Fair value [Member] | Level 2 [Member] |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Other cash equivalents | 80 | 90
Available-for-sale financial assets | 7 | 98
Financial assets at fair value through profit or loss: |  |
Derivatives | 173 | 226
Other |  | 131
Derivatives | (534) | (331)
Fair value [Member] | Level 3 [Member] |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Available-for-sale financial assets | 342 | 273
Financial assets at fair value through profit or loss: |  |
Other | 2 | 1
Contingent consideration | € (445) | € (380)

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