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30. EMPLOYEE BENEFITS (Details 13) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Actuarial liability at the beginning of the year R$ 912,184  
Actuarial liability at the end of the year 758,426 R$ 912,184
Post-employment Healthcare Benefits [member]    
Disclosure of defined benefit plans [line items]    
Actuarial liability at the beginning of the year 892,396 897,137
Expenses recognized in income for the year 57,731 69,907
Sponsor's contributions transferred in prior year (81,340) (82,081)
Recognition of actuarial loss/(gain) (189,907) 7,433
Actuarial liability at the end of the year R$ 678,880 R$ 892,396