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28. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reserves and retained earnings within equity [line items]      
Net income for the year R$ 3,127 R$ 1,700 R$ 1,001
Expired dividends   8  
Incentives tax reserve    
Unrealized profit reserve 835
Retained earnings [member]      
Disclosure of reserves and retained earnings within equity [line items]      
Net income for the year 3,127 1,700 1,001
Expired dividends 42
Incentives tax reserve (18) (9) (1)
Deemed cost realization 25 42 28
Adjustment for initial adoption of IFRS 9 and IFRS 15. (157)
Dividends proposed (764) (867) (500)
Unrealized profit reserve (835)  
Retained earnings reserve R$ 1,535 R$ 751 R$ 528