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Operating Costs And Expenses - Summary of Construction Cost (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of construction cost [abstract]      
Personnel and managers R$ 70 R$ 36 R$ 58
Materials 379 550 534
Outsourced services 364 406 448
Others 84 127 153
Construction cost R$ 897 R$ 1,119 R$ 1,193