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Provisions - Other provisions (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes [Abstract]      
Releases € 88    
Other provisions [Member]      
Provisions [Line items]      
Other provisions at beginning of period 733 € 604 € 575
Changes [Abstract]      
Additional provisions other provisions 304 183 198
Utilizations (238) (167) (186)
Releases (88) (61) (35)
Other changes 4 142 14
Liabilities directly associated with assets held for sale (156)    
Accretion 0 8 7
Acquisitions 62 0 24
Translation differences and other (56) 24 7
Other provisions at end of period € 564 € 733 € 604