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SHAREHOLDERS' EQUITY - Other reserves (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other comprehensive income      
Balances, beginning of year R$ 12,025,935 R$ 11,616,611 R$ 10,124,989
Gain (loss) on conversion of financial statements and on foreign investments 45,819 137,546 38,006
Balances, end of year 18,087,969 12,025,935 11,616,611
Other reserves      
Other comprehensive income      
Balances, beginning of year 2,321,708 2,298,328  
Actuarial gain (loss) (95,283) (45,741)  
Gain (loss) on conversion of financial statements and on foreign investments 47,834 137,546  
Realization of deemed cost, net of taxes (52,918) (68,424)  
Balances, end of year 2,221,342 2,321,708 2,298,328
Debenture conversion 5th issue      
Other comprehensive income      
Balances, beginning of year (45,745) (45,745)  
Actuarial gain (loss) 0 0  
Gain (loss) on conversion of financial statements and on foreign investments 0 0  
Realization of deemed cost, net of taxes 0 0  
Balances, end of year (45,745) (45,745) (45,745)
Actuarial gain (loss)      
Other comprehensive income      
Balances, beginning of year (98,490) (52,749)  
Actuarial gain (loss) (95,283) (45,741)  
Gain (loss) on conversion of financial statements and on foreign investments 0 0  
Realization of deemed cost, net of taxes 0 0  
Balances, end of year (193,773) (98,490) (52,749)
Exchange variation on conversion of financial statements of foreign subsidiaries      
Other comprehensive income      
Balances, beginning of year 164,168 26,622  
Actuarial gain (loss) 0 0  
Gain (loss) on conversion of financial statements and on foreign investments 47,834 137,546  
Realization of deemed cost, net of taxes 0 0  
Balances, end of year 212,002 164,168 26,622
Deemed Cost      
Other comprehensive income      
Balances, beginning of year 2,301,776 2,370,200  
Actuarial gain (loss) 0 0  
Gain (loss) on conversion of financial statements and on foreign investments 0 0  
Realization of deemed cost, net of taxes (52,918) (68,424)  
Balances, end of year R$ 2,248,858 R$ 2,301,776 R$ 2,370,200