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13. INTANGIBLE ASSETS (Details 1) - Discounted Cash Flow [Member]
 12 Months Ended
Dec. 31, 2020
Number
Exchange rate - BRL / USD [member]  
Disclosure of detailed information about intangible assets [line items]  
Exchange rate, 2021 4.89
Exchange rate, 2022 4.32
Exchange rate, 2023 4.07
Exchange rate, 2024 3.95
Exchange rate, 2025 3.87
Inflation brazil [member]  
Disclosure of detailed information about intangible assets [line items]  
Assumptions, 2021 2.84%
Assumptions, 2022 3.50%
Assumptions, 2023 3.56%
Assumptions, 2024 3.55%
Assumptions, 2025 3.40%
Inflation - united states [member]  
Disclosure of detailed information about intangible assets [line items]  
Assumptions, 2021 2.59%
Assumptions, 2022 2.56%
Assumptions, 2023 2.53%
Assumptions, 2024 2.51%
Assumptions, 2025 2.48%