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19 SHAREHOLDERS' EQUITY (Details 1) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number bought back 7,409,500  
Balance in treasury 1,387,524,047 1,387,524,047
Buyback program 9 [Member]    
Board's Authorization [1] 03/31/2015  
Authorized quantity [1] 32,770,055  
Program Period [1] From 4/01/2015 to 6/30/2015  
Balance in treasury [1] 30,391,000  
Buyback program [Member]    
Board's Authorization 04/20/2018  
Authorized quantity 30,391,000  
Program Period From 4/20/2018 to 4/30/2018  
Minimum and maximum buyback price Not applicable  
Disposal of shares 22,981,500  
Balance in treasury 7,409,500  
[1] There was no share buyback in this program.