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16. LEASES (Details 5) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
PresentationOfLeasesForLesseeLineItems [Line Items]      
Lease Liability R$ 530,131 R$ 474,390 R$ 640,989
Right of net use 511,882 472,345  
Financial expenses (50,513) (49,118)  
Depreciation (57,342) (53,826)  
Rate in nominal terms and actual flow [member]      
PresentationOfLeasesForLesseeLineItems [Line Items]      
Lease Liability 595,193 579,390  
Right of net use 547,671 567,905  
Financial expenses (63,744) (57,556)  
Depreciation R$ (59,560) R$ (57,356)