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28. OPERATING COSTS AND EXPENSES (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of construction cost [abstract]      
Personnel and managers R$ 83 R$ 85 R$ 70
Materials 775 595 379
Outsourced services 598 421 364
Others 125 99 84
Construction cost R$ 1,581 R$ 1,200 R$ 897