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32. Operating Costs and Expenses (Details 6) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net R$ 342,713 R$ 413,950 R$ 414,856
Losses in the decommissioning and disposal of assets      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net 106,675 58,569 43,496
Financial offset for the use of water resources      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net 105,310 110,971 183,014
Taxes      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net 84,492 87,759 29,443
Leasing and rent      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net 40,016 32,037 35,453
Compensation      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net 30,949 45,712 89,531
Advertising and publicity      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net 22,135 27,768 37,451
Result of the change in the investment valuation method      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net 3,769 0 (52,107)
Result of disposal of investment      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net (8,174) (28,650) 0
Results of the change in the investment valuation method      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net 0 0 (52,107)
Other net costs and expenses      
DisclosureOfOtherOperatingCostsAndExpensesLineItems [Line Items]      
Other operating costs and expenses, net R$ (42,459) R$ 79,784 R$ 48,575