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Earnings per share (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share      
Dilutive potential common stock outstanding (in shares) 0    
Dilutive earnings per share (In pesos per share) $ 0.00    
Weighted average number of shares outstanding (in shares) 969,159,605 969,159,605 969,159,605