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30. EMPLOYEE BENEFITS (Details 9) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 3,766,193 R$ 3,894,488 R$ 3,403,906
Allocation of plan assets percent 100.00% 100.00% 100.00%
Variable Income [member]      
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 54,285 R$ 25,236 R$ 141,705
Allocation of plan assets percent 1.44% 0.65% 4.16%
Fixed income [member]      
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 3,438,735 R$ 3,607,398 R$ 3,050,099
Allocation of plan assets percent 91.31% 92.63% 89.61%
Real estate [member]      
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 182,145 R$ 183,098 R$ 52,091
Allocation of plan assets percent 4.84% 4.70% 1.53%
Others [member]      
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 91,028 R$ 78,756 R$ 160,011
Allocation of plan assets percent 2.42% 2.02% 4.70%