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22. LOANS, FINANCING AND DEBENTURES (Detaills 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 2,310 R$ 14,777
Transaction costs 57  
Interest paid in advance (25)  
Discount (18)  
Overall total 15,020  
IPCA [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 4,863  
UFIR/RGR [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [2] 8  
CDI [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 2,310  
URTJ/TJLP [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [4] 73  
Total By Index [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 7,254  
Total Currency Denominated [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 7,866  
2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (12)  
Interest paid in advance  
Discount  
Overall total 2,060  
2021 [member] | IPCA [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 1,043  
2021 [member] | UFIR/RGR [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [2] 3  
2021 [member] | CDI [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 912  
2021 [member] | URTJ/TJLP [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [4] 53  
2021 [member] | Total By Index [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,011  
2021 [member] | Total Currency Denominated [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 61  
3 months to 1 year [member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (18)  
Interest paid in advance (25)  
Discount  
Overall total 8,371  
3 months to 1 year [member] | IPCA [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 341  
3 months to 1 year [member] | CDI [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 268  
3 months to 1 year [member] | Total By Index [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 609  
3 months to 1 year [member] | Total Currency Denominated [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 7,805  
1 to 3 months [member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (1)  
Interest paid in advance  
Discount  
Overall total 1,207  
1 to 3 months [member] | IPCA [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 615  
1 to 3 months [member] | UFIR/RGR [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [2] 3  
1 to 3 months [member] | CDI [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 570  
1 to 3 months [member] | URTJ/TJLP [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [4] 20  
1 to 3 months [member] | Total By Index [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,208  
2023 [member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (1)  
Interest paid in advance  
Discount  
Overall total 809  
2023 [member] | IPCA [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 248  
2023 [member] | UFIR/RGR [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [2] 2  
2023 [member] | CDI [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 560  
2023 [member] | Total By Index [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 810  
2025 [member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (5)  
Interest paid in advance  
Discount (9)  
Overall total 1,124  
2025 [member] | IPCA [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 1,138  
2025 [member] | Total By Index [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,138  
2026 [member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (20)  
Interest paid in advance  
Discount (9)  
Overall total 1,449  
2026 [member] | IPCA [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 1,478  
2026 [member] | Total By Index [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,478  
United States of America, Dollars    
Disclosure of detailed information about borrowings [line items]    
Borrowings 7,866  
United States of America, Dollars | 2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 61  
United States of America, Dollars | 3 months to 1 year [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 7,805  
[1] Expanded National Customer Price (IPCA) Index.
[2] Fiscal Reference Unit (Ufir / RGR).
[3] CDI: Interbank Rate for Certificates of Deposit.
[4] Interest rate reference unit (URTJ) / Long-Term Interest Rate (TJLP)