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28. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Apr. 23, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share capital   R$ 7,294 R$ 7,294 R$ 7,294
Number of shares issued 199,910,947 1,258,841,654 1,458,752,601 1,258,841,654
Nominal Value R$ 5.00 R$ 5.00    
Net profit share   R$ 2,834    
Dividend paid   R$ 1,564    
Percentage of dividend distributed   50.00%    
Unrealized profit reserve   R$ 835 R$ 835  
Percentage of right to reduction in income tax   75.00%    
Period of right to reduction in income tax   10 years    
Right to reduction in income tax, starting period   2014    
Amount of incentive recognized in statement of income   R$ 18 9 R$ 1
Tax incentives reserve   R$ 85 67 58
Minimum percentage right to appoint board member   10.00%    
Mandatory dividends payout percentage   50.00%    
Percentage of dividend on portion of equity   3.00%    
Percentage of dividend on par value   10.00%    
Net income (loss) for the year   R$ 3,128 1,742 1,002
Realization of the deemed cost of PP&E   25    
Minimum mandatory dividend payable   764    
Interest on equity   400    
Dividend payable   364    
Retained earnings reserve   1,535    
Incentives tax reserve   18    
Profit reserve exceed share capital   537    
Increase in share capital R$ 1,000 R$ 7,594    
Description of shares held by private individuals   Shares held by private individuals and issued up to August 5, 2004 have the right to a minimum dividend of 6% per year on their par value in all years.    
Subscribed paid up capital   R$ 1,325    
Capital reserve   R$ 2,250 R$ 2,250 R$ 1,925
Bottom Of Range [Member]        
Increase in share capital 6,294      
Top of Range [Member]        
Percentage of increase in share capital   10.00%    
Increase in share capital R$ 7,294      
Common Shares [Member]        
Number of shares issued 199,910,947 487,614,213 487,614,213  
Nominal Value   R$ 5.00 R$ 5.00  
Minimum percentage for multiple vote procedure   5.00%    
Minimum percentage right to appoint board member   15.00%    
Preferred Shares [Member]        
Number of shares issued 199,910,947 971,138,388 971,138,388 838,076,946
Nominal Value   R$ 5.00 R$ 5.00  
Minimum percentage right to appoint board member   10.00%    
Preferred Shares [Member] | Bottom Of Range [Member]        
Dividend paid   R$ 486