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20. Employees benefits (Details 9) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfEmployeeBenefitsLineItems [Line Items]        
Defined benefit obligation, beginning of the year R$ 2,319,841 R$ 2,465,721 R$ 2,252,204  
Current interest expense and service costs 213,201      
Actuarial (gains)/losses recorded as other comprehensive income   287,547 (472,266) R$ 36,366
Benefits paid   (118,360) (123,346)  
Defined benefit obligation, end of the year   2,319,841 2,465,721 2,252,204
Unfunded plan        
SummaryOfEmployeeBenefitsLineItems [Line Items]        
Defined benefit obligation, beginning of the year R$ 2,543,877 2,512,080 2,166,942  
Current interest expense and service costs   262,873 282,117 248,054
Actuarial (gains)/losses recorded as other comprehensive income   (51,535) 241,711  
Benefits paid   (179,541) (178,690)  
Defined benefit obligation, end of the year   R$ 2,543,877 R$ 2,512,080 R$ 2,166,942