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Schedule of construction cost (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Costs And Expenses      
Personnel and managers R$ 100 R$ 83 R$ 85
Materials 1,150 775 595
Outsourced services 682 598 421
Others 104 125 99
 Construction cost R$ 2,036 R$ 1,581 R$ 1,200