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14. FINANCIAL INSTRUMENTS (Details 5) - Foreign exchange risk [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
UNITED STATES [member] | Net exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount R$ 48,679
Risk Dollar
UNITED STATES [member] | Gross exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount R$ (3,876,521)
Risk Dollar
UNITED STATES [member] | Cash flow hedges [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount R$ 3,992,200
Risk Dollar
Euro [member] | Net exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount R$ 10,138
Risk Euro
Probable scenario [member] | UNITED STATES [member] | Net exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss R$ 3,164 [1]
Probable scenario [member] | UNITED STATES [member] | Gross exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss (251,974) [1]
Probable scenario [member] | UNITED STATES [member] | Cash flow hedges [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 259,493
Probable scenario [member] | Euro [member] | Net exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 89 [1]
Scenario 1 [member] | UNITED STATES [member] | Net exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 63,242
Scenario 1 [member] | UNITED STATES [member] | Gross exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss (5,036,279)
Scenario 1 [member] | UNITED STATES [member] | Cash flow hedges [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 5,186,566
Scenario 1 [member] | Euro [member] | Net exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 16,165
Scenario 2 [member] | UNITED STATES [member] | Net exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 126,486
Scenario 2 [member] | UNITED STATES [member] | Gross exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss (10,072,558)
Scenario 2 [member] | UNITED STATES [member] | Cash flow hedges [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 10,373,133
Scenario 2 [member] | Euro [member] | Net exchange position [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 32,330
Exchange rate swap dollar x euro [member] | UNITED STATES [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount R$ 40,697
Risk Dollar
Exchange rate swap dollar x euro [member] | Probable scenario [member] | UNITED STATES [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss R$ 5,264 [1]
Exchange rate swap dollar x euro [member] | Scenario 1 [member] | UNITED STATES [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 50,134
Exchange rate swap dollar x euro [member] | Scenario 2 [member] | UNITED STATES [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss 78,337
Exchange rate swap CDI x dollar [member] | UNITED STATES [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount R$ (67,000)
Risk Dollar
Exchange rate swap CDI x dollar [member] | Probable scenario [member] | UNITED STATES [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss R$ (4,355) [1]
Exchange rate swap CDI x dollar [member] | Scenario 1 [member] | UNITED STATES [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss (87,045)
Exchange rate swap CDI x dollar [member] | Scenario 2 [member] | UNITED STATES [member]  
Disclosure of detailed information about financial instruments [line items]  
Impact on profit or loss R$ (174,089)
[1] The probable scenarios were calculated considering the following variations for risks: Real x Dollar - devaluation of the Real by 1.25% / Real x Euro - devaluation of the Real by 0.14% / Euro x Dollar - appreciation of Euro by 1.20%, Source: Central Bank of Brazil and European Central Bank quotations on 1/14/2021.