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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, 2018 | Dec. 31, 2017
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Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Financial assets at fair value through other comprehensive income | € 329 |
Available-for-sale financial assets |  | € 564
Financial assets at fair value through profit or loss: |  |
Other | 1,516 | 1,445
Fair value [member] |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Financial assets at fair value through other comprehensive income | 329 |
Available-for-sale financial assets |  | 564
Financial assets at fair value through profit or loss: |  |
Derivatives | 276 | 173
Other | 364 | 139
Derivatives | (542) | (534)
Contingent consideration | (142) | (445)
Fair value [member] | Level 1 [member] |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Financial assets at fair value through other comprehensive income | 160 |
Available-for-sale financial assets |  | 215
Financial assets at fair value through profit or loss: |  |
Other | 145 | 137
Fair value [member] | Level 2 [member] |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Financial assets at fair value through other comprehensive income | 5 |
Available-for-sale financial assets |  | 7
Financial assets at fair value through profit or loss: |  |
Derivatives | 276 | 173
Derivatives | (542) | (534)
Fair value [member] | Level 3 [member] |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |
Financial assets at fair value through other comprehensive income | 164 |
Available-for-sale financial assets |  | 342
Financial assets at fair value through profit or loss: |  |
Other | 219 | 2
Contingent consideration | € (142) | € (445)

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