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Shareholders' equity - Treasury shares (Details) - TOTAL S.A. - shares
3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Shareholders' equity    
Treasury shares 41,429,820  
Percentage of share capital 1.55%  
Shares intended to be canceled 32,600,041  
Shares definitively acquired during the period and intended to be canceled 18,576,360 9,820,488
Shares intended to be canceled, buyback not yet executed 4,203,193  
TOTAL share grant plans for Group employees    
Shareholders' equity    
Shares allocated or intended to be allocated to share purchase option plans or share grant plans 8,760,020  
New TOTAL share purchase option plans or new share grant plans    
Shareholders' equity    
Shares allocated or intended to be allocated to share purchase option plans or share grant plans 69,759