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15. INCOME TAX AND SOCIAL CONTRIBUTION (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax And Social Contribution Details Abstract      
Income tax and social contribution income (expense), current R$ (827,229) R$ (358,981) R$ (206,178)
Income tax and social contribution income (expense), deferred 576,895 (50,128) (60,368)
Income tax and social contribution income (expense) R$ (250,334) R$ (409,109) R$ (266,546)