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26 EMPLOYEE BENEFITS (Details 13) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
EmployeeBenefitsLineItems [Line Items]    
Actuarial liability at the beginning of the year R$ 905,119  
Actuarial liability at the end of the year 912,184 R$ 905,119
Post-employment Healthcare Benefits [Member]    
EmployeeBenefitsLineItems [Line Items]    
Actuarial liability at the beginning of the year 897,137 866,784
Expenses recognized in income for the year 69,907 85,748
Sponsor's contributions transferred in prior year (82,081) (71,632)
Recognition of actuarial loss/(gain) 7,433 16,237
Actuarial liability at the end of the year R$ 892,396 R$ 897,137