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EMPLOYEE BENEFITS - Defined benefit pension plan - Reconciliation of plan assets and liabilities (Details) - Defined benefit pension plan - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliations of assets and liabilities of the plans        
Net R$ (1,084,758) R$ (1,088,773)    
Plan assets   55,307    
Defined benefit obligation (1,084,758) (1,144,080)    
Present value of the defined benefit obligations        
Reconciliations of assets and liabilities of the plans        
Net (4,314,592) (4,174,653) R$ (4,739,299) R$ (3,791,670)
Fair value of plan assets        
Reconciliations of assets and liabilities of the plans        
Net 3,456,613 3,292,890 R$ 3,865,411 R$ 3,319,133
Asset ceiling restrictions on recognition of net funded assets        
Reconciliations of assets and liabilities of the plans        
Net R$ (226,779) R$ (207,010)