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Equity (Details 2) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
 [1]
Changes in capital stock, in number of shares      
Number of shares outstanding on 6,085,073,610 6,085,073,610 [1] 6,085,665,540
Shares acquired and not canceled   (591,930)  
Common shares      
Changes in capital stock, in number of shares      
Number of shares outstanding on 3,049,448,563 3,049,448,563 [1] 3,050,040,493
Shares acquired and not canceled   (591,930)  
Preferred shares      
Changes in capital stock, in number of shares      
Number of shares outstanding on 3,035,625,047 3,035,625,047 [1] 3,035,625,047
[1] All share amounts presented for prior periods have been adjusted to reflect the stock split approved at the Board of Directors' Meeting of March 10, 2017 in proportion of one new share for every 10 shares held.