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Insurance technical provisions and pension plans (Details Text) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Insurance technical provisions and pension plans (Details Text)    
The claims table does not include the products R$ 5,365,506 R$ 5,376,403
Health and Dental insurance    
Insurance technical provisions and pension plans (Details Text)    
The claims table does not include the products 2,906,361  
DPVAT insurance    
Insurance technical provisions and pension plans (Details Text)    
The claims table does not include the products 86,592  
Retrocession    
Insurance technical provisions and pension plans (Details Text)    
The claims table does not include the products 21,722  
Salvage and reimbursement estimates    
Insurance technical provisions and pension plans (Details Text)    
The claims table does not include the products R$ (163,923)