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26 EMPLOYEE BENEFITS (Details 10)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
shares
Healthcare Plan [Member] | Possible Increase [Member] | Actuarial Assumption Of Discount Rates [Member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 0.50%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 986
Effect on present value of obligations | shares (16,683)
Healthcare Plan [Member] | Possible Decrease [Member] | Actuarial Assumption Of Discount Rates [Member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (0.50%)
Plan covering 35% Of The Average Salary [Member] | Possible Increase [Member] | Actuarial assumption of expected rates of salary increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 0.50%
Plan covering 35% Of The Average Salary [Member] | Possible Increase [Member] | Actuarial assumption of expected rates of pension increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 0.50%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 142
Effect on present value of obligations | shares 2,100
Plan covering 35% Of The Average Salary [Member] | Possible Increase [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$ 1,561
Effect on present value of obligations | shares 13,515
Plan covering 35% Of The Average Salary [Member] | 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$ (918)
Effect on present value of obligations | shares 18,012
Plan covering 35% Of The Average Salary [Member] | Possible Decrease [Member] | Actuarial assumption of expected rates of salary increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (0.50%)
Plan covering 35% Of The Average Salary [Member] | Possible Decrease [Member] | Actuarial assumption of expected rates of pension increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (0.50%)
Effect on current service cost and on interest on actuarial obligations | R$ R$ (125)
Effect on present value of obligations | shares (1,846)
Plan covering 35% Of The Average Salary [Member] | Possible Decrease [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$ (649)
Effect on present value of obligations | shares (9,603)
Average Salary Supplementation Plan [Member] | 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$ 3,847
Effect on present value of obligations | shares (83,364)
Average Salary Supplementation Plan [Member] | Possible Increase [Member] | Actuarial assumption of expected rates of salary increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 0.50%
Average Salary Supplementation Plan [Member] | Possible Increase [Member] | Actuarial assumption of expected rates of pension increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 0.50%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 927
Effect on present value of obligations | shares 13,609
Average Salary Supplementation Plan [Member] | Possible Increase [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$ 4,715
Effect on present value of obligations | shares 69,216
Average Salary Supplementation Plan [Member] | 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$ (3,773)
Effect on present value of obligations | shares 98,252
Average Salary Supplementation Plan [Member] | Possible Decrease [Member] | Actuarial assumption of expected rates of salary increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (0.50%)
Average Salary Supplementation Plan [Member] | Possible Decrease [Member] | Actuarial assumption of expected rates of pension increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (0.50%)
Effect on current service cost and on interest on actuarial obligations | R$ R$ (405)
Effect on present value of obligations | shares (5,945)
Average Salary Supplementation Plan [Member] | Possible Decrease [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$ (4,180)
Effect on present value of obligations | shares (61,372)
Mixed Supplementary Benefit Plan [Member] | 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$ 897
Effect on present value of obligations | shares (66,416)
Mixed Supplementary Benefit Plan [Member] | Possible Increase [Member] | Actuarial assumption of expected rates of salary increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 0.50%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 212
Effect on present value of obligations | shares 1,122
Mixed Supplementary Benefit Plan [Member] | Possible Increase [Member] | Actuarial assumption of expected rates of pension increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level 0.50%
Effect on current service cost and on interest on actuarial obligations | R$ R$ 387
Effect on present value of obligations | shares 5,543
Mixed Supplementary Benefit Plan [Member] | Possible Increase [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$ 1,543
Effect on present value of obligations | shares 22,116
Mixed Supplementary Benefit Plan [Member] | 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$ (1,126)
Effect on present value of obligations | shares 73,565
Mixed Supplementary Benefit Plan [Member] | Possible Decrease [Member] | Actuarial assumption of expected rates of salary increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (0.50%)
Effect on current service cost and on interest on actuarial obligations | R$ R$ (200)
Effect on present value of obligations | shares (1,063)
Mixed Supplementary Benefit Plan [Member] | Possible Decrease [Member] | Actuarial assumption of expected rates of pension increases [member]  
EmployeeBenefitsLineItems [Line Items]  
Sensitivity level (0.50%)
Effect on current service cost and on interest on actuarial obligations | R$ R$ (387)
Effect on present value of obligations | shares (5,543)
Mixed Supplementary Benefit Plan [Member] | Possible Decrease [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$ (1,532)
Effect on present value of obligations | shares (22,214)