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Financial Instruments - Summary of Derivatives Measured at Fair Value (Detail) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets-derivatives € 26 € 30
Other financial liabilities-derivatives 69 89
Level 1 of fair value hierarchy [member]    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets-derivatives 5 9
Other financial liabilities-derivatives 32 50
Level 2 of fair value hierarchy [member]    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets-derivatives 21 21
Other financial liabilities-derivatives € 37 € 39