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11 BORROWINGS, FINANCING AND DEBENTURES (Details 4) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Raised R$ 10,149,381    
Amortization of principal (11,775,093)    
Amortization of charges (2,039,112) R$ (2,141,710) R$ (2,634,931)
Prepayment [Member]      
Disclosure of detailed information about borrowings [line items]      
Raised 805,288    
Amortization of principal (1,596,711)    
Amortization of charges (319,257)    
Bonds, Perpetual Bonds, ACC and Facility [Member]      
Disclosure of detailed information about borrowings [line items]      
Raised 6,616,544    
Amortization of principal (5,959,029)    
Amortization of charges (882,007)    
BNDES/FINAME, Debentures, NCE and CCB [Member]      
Disclosure of detailed information about borrowings [line items]      
Raised 2,727,549    
Amortization of principal (4,219,353)    
Amortization of charges R$ (837,848)