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16. LEASES (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Presentation of leases for lessee [abstract]    
Opening balance R$ 474,390 R$ 640,989
New leases 52,835 106,584
Present Value Adjustments - New leases (6,511) (54,080)
Contract review 63,250 (175,609)
Write off (7,757) (1,374)
Payments (103,648) (94,727)
Interest appropriated 54,236 52,607
Exchange variation 3,336
Net balance R$ 530,131 R$ 474,390