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28. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 7) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Dividends [line items]        
Percentage applied to the nominal value of the preferred shares 6.00%   6.00%  
Equity R$ 15,891 R$ 15,939 R$ 14,330 R$ 12,934
Net income for the year 3,127 1,700 1,001  
Unrealized profit reserve 835 835    
Withholding income tax on Interest on equity 35 17    
Minimum Dividend under the by-laws including income tax on interest on equity 764 867 500  
Dividends recorded, as specified in the by-laws Interest on Equity 400 210    
Ordinary dividends 364 657 500  
Dividends and interest on equity 764 R$ 867 R$ 500  
Total dividends for the common shares R$ 364      
Mandatory dividends (including withholding income tax on Interest on Equity) R$ 0.59 R$ 0.52 R$ 0.34  
Dividend Distribution [member]        
Disclosure of Dividends [line items]        
Equity R$ 15,887 R$ 14,579 R$ 14,326  
Net income for the year R$ 3,127 R$ 1,700 1,001  
Preferred Shares [Member]        
Disclosure of Dividends [line items]        
Percentage applied to the nominal value of the preferred shares 10.00% 10.00%    
Percentage applied to the portion of Equity represented by the preferred shares 3.00% 3.00%    
Amount of the dividends by the second payment criterion R$ 317      
Minimum Dividends required by the Bylaws for the preferred shares 486      
Mandatory dividends - 50% of Net income 1,564      
Preferred Shares [Member] | Dividend Distribution [member]        
Disclosure of Dividends [line items]        
Nominal value of the preferred shares 4,856 R$ 4,856 4,191  
Nominal value of the preferred shares to be capitalized     665  
Preferred shares R$ 4,856 R$ 4,856 R$ 4,856  
Percentage applied to the nominal value of the preferred shares 10.00% 10.00% 10.00%  
Amount of the dividends by the first payment criterion R$ 486 R$ 486 R$ 486  
Preferred shares as a percentage of Equity (net of shares held in Treasury) 66.56% 66.56% 66.58%  
Equity R$ 10,574 R$ 9,704 R$ 9,538  
Percentage applied to the portion of Equity represented by the preferred shares 3.00% 3.00% 3.00%  
Amount of the dividends by the second payment criterion R$ 371 R$ 291 R$ 286  
Minimum Dividends required by the Bylaws for the preferred shares 486 486 486  
Mandatory dividends - 50% of Net income 1,564 850 500  
Preferred Shares [Member]        
Disclosure of Dividends [line items]        
Total dividends for the common shares R$ 577 R$ 509 R$ 486  
Minimum dividends required by the by-laws for the preferred shares R$ 0.50 R$ 0.50 R$ 0.50  
Dividends proposed: Common (ON) shares 0.52 0.59 0.03  
Dividends proposed: Preferred (PN) shares R$ 0.52 R$ 0.59 R$ 0.5  
Common Shares [Member]        
Disclosure of Dividends [line items]        
Total dividends for the common shares R$ 255 R$ 290 R$ 14  
Dividends proposed: Common (ON) shares R$ 0.52 R$ 0.59 R$ 0.03  
Dividends proposed: Preferred (PN) shares R$ 0.52 R$ 0.59 R$ 0.5