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SHAREHOLDERS' EQUITY - Other reserves (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other comprehensive income (loss)      
Balances, beginning of the year R$ 18,087,969 R$ 12,025,934 R$ 11,616,610
Gain (loss) on conversion of financial statements and on foreign investments [1] (2,857) 45,819 137,546
Balances, end of the year 7,337,378 18,087,969 12,025,934
Other reserves      
Other comprehensive income (loss)      
Balances, beginning of the year 2,221,341 2,321,708  
Actuarial loss (22,037) (95,628)  
Gain on conversion of financial asset and fair value 4,151 2,360  
Gain (loss) on conversion of financial statements and on foreign investments (2,857) 45,819  
Realization of deemed cost, net of taxes   (52,918)  
Partial Realization of deemed cost, net of taxes (70,654)    
Balances, end of the year 2,129,944 2,221,341 2,321,708
Debenture conversion 5th issue      
Other comprehensive income (loss)      
Balances, beginning of the year (45,746) (45,746)  
Balances, end of the year (45,746) (45,746) (45,746)
Actuarial loss      
Other comprehensive income (loss)      
Balances, beginning of the year (194,118) (98,490)  
Actuarial loss (22,037) (95,628)  
Balances, end of the year (216,155) (194,118) (98,490)
Exchange variation and fair value of financial assets      
Other comprehensive income (loss)      
Balances, beginning of the year 2,360 0  
Gain on conversion of financial asset and fair value 4,151 2,360  
Balances, end of the year 6,511 2,360 0
Exchange variation on conversion of financial statements of foreign subsidiaries      
Other comprehensive income (loss)      
Balances, beginning of the year 209,987 164,168  
Gain (loss) on conversion of financial statements and on foreign investments (2,857) 45,819  
Balances, end of the year 207,130 209,987 164,168
Deemed Cost      
Other comprehensive income (loss)      
Balances, beginning of the year 2,248,858 2,301,776  
Realization of deemed cost, net of taxes   (52,918)  
Partial Realization of deemed cost, net of taxes (70,654)    
Balances, end of the year R$ 2,178,204 R$ 2,248,858 R$ 2,301,776
[1] As of December 31, 2020 includes the exchange variation related to investments abroad of wholly-owned subsidiaries whose functional currencies are different from the Brazilian Real (notes 3.1.1 and 3.2.5). As of December 31, 2019 and 2018 includes the (i) exchange variation related to investments abroad of wholly-owned subsidiaries and (ii) hyperinflation referring to the wholly owned subsidiary Stenfar (note 3.2.6).