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Shareholders' equity and share-based payments - Variation of share capital (Details)
12 Months Ended
Dec. 31, 2017
EquityInstruments
shares
Dec. 31, 2016
EquityInstruments
shares
Dec. 31, 2015
EquityInstruments
shares
Variation of the share capital      
Treasury shares 8,376,756 10,587,822 113,967,758
Common shares issued      
Variation of the share capital      
Common shares issued as of the beginning of the period 2,430,365,862 2,440,057,883 2,385,267,525
Capital increase reserved for employees 9,532,190   10,479,410
Capital increase within stock dividend 86,442,256 88,401,329 42,841,342
Exercise of TOTAL share subscription options | EquityInstruments 2,649,308 2,237,918 1,469,606
Cancellation of treasury shares   (100,331,268)  
Common shares issued as of the end of the period 2,528,989,616 2,430,365,862 2,440,057,883