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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
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.