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Financial income and expenses - Text Details (Detail) - EUR (€)
€ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial income and expenses [Abstract]        
Finance income (cost)   € (213) € (137) € (442)
Increase (decrease) in financial income expense   (76) (305)  
Financial charges related to early redemption of bonds € (153) (46)    
Increase (decrease) in net interest expense   (25) (117)  
Impairment loss on financial assets   € (0) € 2 € 24