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Financial Instruments - Summary of Derivatives Measured at Fair Value (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets-derivatives € 30 € 96
Other financial liabilities-derivatives 89 66
Level 1 of fair value hierarchy [member]    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets-derivatives 9 46
Other financial liabilities-derivatives 50 6
Level 2 of fair value hierarchy [member]    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets-derivatives 21 50
Other financial liabilities-derivatives € 39 € 60