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Trade and other payables (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Trade And Other Payables [Abstract]    
Trade payables € 10,890 € 11,038
Advances 797 526
Other payables    
- related to capital expenditures 2,094 2,158
- others 2,967 2,981
Other current payables 5,061 5,139
Trade and other current payables € 16,748 € 16,703