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16. LEASES (Details 3) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Presentation of leases for lessee [abstract]    
Leases R$ 1,603,100 R$ 1,489,789
Present value adjustment - Leases (1,091,275) (1,026,919)
Potencial PIS and COFINS credit 148,287 137,805
Present value adjustment - Potential PIS and COFINS credit R$ (100,943) R$ (96,461)