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30. OPERATING COSTS AND EXPENSES (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of construction cost [abstract]      
Personnel and managers R$ 85 R$ 70 R$ 36
Materials 595 379 550
Outsourced services 421 364 406
Others 99 84 127
Construction cost R$ 1,200 R$ 897 R$ 1,119