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1 Operations (Details 5) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jun. 28, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfOperationsLineItems [Line Items]          
Assets identified R$ 38,312,550 R$ 35,930,100      
Cash and cash equivalents 2,941,727 1,948,409   R$ 1,040,075 R$ 982,073
Taxes recoverable 236,929 152,157      
Other receivables 2,617,638 2,550,691      
Suppliers 187,913 49,956      
Taxes due 293,666 157,420   R$ (156,630)  
Deferred taxes 1,606,713 R$ 1,664,773      
Net assets acquired 133,739        
Fair Value [Member]          
SummaryOfOperationsLineItems [Line Items]          
Assets identified 144,593        
Cash and cash equivalents 9,803        
Trade accounts receivable 2,921        
Taxes recoverable 17        
Contract assets [1] 120,213        
Other receivables 1,051        
Deferred taxes - business combination 10,588        
Liabilities assumed 30,884        
Suppliers 6,115        
Payroll, social charges and accruals 73        
Taxes due 320        
Sectorial charges due 1,572        
Deferred taxes 4,097        
Contingent liabilities - business combination 18,344        
Others liabilities 363        
Net assets acquired 113,709   R$ 113,709    
Carrying Amount [Member]          
SummaryOfOperationsLineItems [Line Items]          
Assets identified 146,802        
Cash and cash equivalents 9,803        
Trade accounts receivable 2,921        
Taxes recoverable 17        
Contract assets [1] 133,010        
Other receivables 1,051        
Deferred taxes - business combination        
Liabilities assumed 12,540        
Suppliers 6,115        
Payroll, social charges and accruals 73        
Taxes due 320        
Sectorial charges due 1,572        
Deferred taxes 4,097        
Contingent liabilities - business combination        
Others liabilities 363        
Net assets acquired R$ 134,262        
[1] The book value of contract assets disclosed by the acquired subsidiary was adjusted pursuant to the Company's practices before allocation of fair value in the business combination.