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30. EMPLOYEE BENEFITS (Details 14) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Post-employment Healthcare Benefits [member]      
Disclosure of defined benefit plans [line items]      
Gain/(loss) recognized in shareholders' equity R$ (189,907) R$ 7,433 R$ 16,237