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24. LOANS, FINANCING AND DEBENTURES (Detaills 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 14,777 R$ 14,772
Transaction costs (48)  
Interest paid in advance (30)  
Discount (22)  
Overall total 14,777  
IPCA [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 4,725  
UFIR/RGR [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [2] 20  
CDI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 3,773  
URTJ/TJLP [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [4] 244  
IGP-DI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [5] 5  
Total By Index [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 8,767  
Total Currency Denominated [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 6,110  
2020 [Member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (11)  
Interest paid in advance  
Discount  
Overall total 2,744  
2020 [Member] | IPCA [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 1,027  
2020 [Member] | UFIR/RGR [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [2] 11  
2020 [Member] | CDI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 1,465  
2020 [Member] | URTJ/TJLP [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [4] 202  
2020 [Member] | IGP-DI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [5] 2  
2020 [Member] | Total By Index [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,707  
2020 [Member] | Total Currency Denominated [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 48  
2024 [Member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (19)  
Interest paid in advance (30)  
Discount  
Overall total 6,521  
2024 [Member] | IPCA [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 237  
2024 [Member] | CDI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 271  
2024 [Member] | Total By Index [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 508  
2024 [Member] | Total Currency Denominated [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 6,062  
2021 [Member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (10)  
Interest paid in advance  
Discount  
Overall total 1,803  
2021 [Member] | IPCA [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 881  
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] 907  
2021 [Member] | URTJ/TJLP [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [4] 21  
2021 [Member] | IGP-DI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [5] 1  
2021 [Member] | Total By Index [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,813  
2022 [Member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (1)  
Interest paid in advance  
Discount  
Overall total 1,182  
2022 [Member] | IPCA [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 588  
2022 [Member] | UFIR/RGR [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [2] 3  
2022 [Member] | CDI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 570  
2022 [Member] | URTJ/TJLP [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [4] 21  
2022 [Member] | IGP-DI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [5] 1  
2022 [Member] | Total By Index [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,183  
2023 [Member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (1)  
Interest paid in advance  
Discount  
Overall total 800  
2023 [Member] | IPCA [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 237  
2023 [Member] | UFIR/RGR [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [2] 3  
2023 [Member] | CDI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [3] 560  
2023 [Member] | IGP-DI [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [5] 1  
2023 [Member] | Total By Index [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 801  
2025 [Member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (3)  
Interest paid in advance  
Discount (11)  
Overall total 982  
2025 [Member] | IPCA [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 996  
2025 [Member] | Total By Index [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 996  
2026 [Member]    
Disclosure of detailed information about borrowings [line items]    
Transaction costs (3)  
Interest paid in advance  
Discount (11)  
Overall total 745  
2026 [Member] | IPCA [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings [1] 759  
2026 [Member] | Total By Index [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 759  
United States of America, Dollars    
Disclosure of detailed information about borrowings [line items]    
Borrowings 6,110  
United States of America, Dollars | 2020 [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 48  
United States of America, Dollars | 2024 [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 6,062  
[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)
[5] IGP-DI ('General - Domestic Availability') Price Index.