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11 BORROWINGS, FINANCING AND DEBENTURES (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities R$ 22,841,193 R$ 23,173,635
2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 3,576,306  
2022 [member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 3,311,843  
2023 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 7,378,252  
2024 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 1,640,183  
After 2025 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 2,932,590  
Perpetual Bonds [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 4,030,700  
2025 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 68,595  
Bank Loans [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 10,105,678  
Bank Loans [Member] | 2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 2,884,003  
Bank Loans [Member] | 2022 [member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 2,700,341  
Bank Loans [Member] | 2023 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 2,945,897  
Bank Loans [Member] | 2024 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 1,575,437  
Capital Markets [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 12,020,851  
Capital Markets [Member] | 2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 636,667  
Capital Markets [Member] | 2022 [member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 556,666  
Capital Markets [Member] | 2023 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 4,378,398  
Capital Markets [Member] | After 2025 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 2,418,420  
Capital Markets [Member] | Perpetual Bonds [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 4,030,700  
Development Agencies [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 811,940  
Development Agencies [Member] | 2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 55,636  
Development Agencies [Member] | 2022 [member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 54,836  
Development Agencies [Member] | 2023 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 53,957  
Development Agencies [Member] | 2024 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 64,746  
Development Agencies [Member] | After 2025 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities 514,170  
Development Agencies [Member] | 2025 [Member]    
Disclosure of detailed information about borrowings [line items]    
Long-term liabilities R$ 68,595