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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
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)