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30. EMPLOYEE BENEFITS (Details 17) - Healthcare plan [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
shares
Possible Increase [member] | Actuarial assumption of discount rates [member]  
Disclosure of defined benefit plans [line items]  
Sensitivity level 0.50%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 1,216
Effect on present value of obligations | shares (30,300)
Possible Increase [member] | Actuarial assumption of medical inflation [member]  
Disclosure of defined benefit plans [line items]  
Sensitivity level 1.00%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 4,749
Effect on present value of obligations | shares 72,688
Possible Increase [member] | Actuarial assumption of mortality table [member]  
Disclosure of defined benefit plans [line items]  
Sensitivity level, year +1 year
Effect on current service cost and on interest on actuarial obligations | R$ R$ 3,123
Effect on present value of obligations | shares 47,797
Possible Decrease [member] | Actuarial assumption of discount rates [member]  
Disclosure of defined benefit plans [line items]  
Sensitivity level (0.50%)
Effect on current service cost and on interest on actuarial obligations | R$ R$ (1,339)
Effect on present value of obligations | shares 33,447
Actuarial assumption of medical inflation [member] | Actuarial assumption of discount rates [member]  
Disclosure of defined benefit plans [line items]  
Sensitivity level (1.00%)
Effect on current service cost and on interest on actuarial obligations | R$ R$ (3,978)
Effect on present value of obligations | shares (60,887)
Actuarial assumption of mortality table [member] | Actuarial assumption of mortality rates [member]  
Disclosure of defined benefit plans [line items]  
Sensitivity level, year - 1 year
Effect on current service cost and on interest on actuarial obligations | R$ R$ (2,925)
Effect on present value of obligations | shares (44,768)