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Summary of Significant Accounting Policies - Opening Financial Position Reclassification (IFRS 15 Standard) (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reclassifications or changes in presentation [line items]        
Trade receivables and other   € 485 € 467  
Trade payables and other   (1,025) (984)  
Provisions € (140) (130) € (153) € (149)
Increase (decrease) due to application of IFRS 15 [member]        
Disclosure of reclassifications or changes in presentation [line items]        
Trade receivables and other   18    
Trade payables and other   (41)    
Provisions   € 23