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26 EMPLOYEE BENEFITS (Details 17) - Healthcare Plan [Member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
shares
Possible Increase [Member] | Actuarial Assumption Of Discount Rates [Member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 0.50%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 1,824
Effect on present value of obligations | shares (35,490)
Possible Increase [Member] | Actuarial Assumption Of Medical Inflation [Member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 1.00%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 5,646
Effect on present value of obligations | shares 83,270
Possible Increase [Member] | Actuarial Assumption Of Mortality Table [Member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level, year +1 year
Effect on current service cost and on interest on actuarial obligations | R$ R$ 4,093
Effect on present value of obligations | shares 60,367
Possible Decrease [Member] | Actuarial Assumption Of Discount Rates [Member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (0.50%)
Effect on current service cost and on interest on actuarial obligations | R$ R$ (2,006)
Effect on present value of obligations | shares 38,444
Actuarial Assumption Of Medical Inflation [Member] | Actuarial Assumption Of Discount Rates [Member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (1.00%)
Effect on current service cost and on interest on actuarial obligations | R$ R$ (4,900)
Effect on present value of obligations | shares (72,264)
Actuarial Assumption Of Mortality Table [Member] | Actuarial Assumption Of Mortality Rates [Member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level, year -1 year
Effect on current service cost and on interest on actuarial obligations | R$ R$ (3,851)
Effect on present value of obligations | shares (56,802)