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26. EMPLOYEE BENEFITS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of fair value of plan assets [line items]      
Actuarial assets R$ (111,281) R$ (119,854)  
Actuarial liabilities 908,721 719,266  
Pension plan benefits      
Disclosure of fair value of plan assets [line items]      
Actuarial assets (111,281) (119,854)  
Actuarial liabilities 41,937 28,004  
Post-employment healthcare benefits      
Disclosure of fair value of plan assets [line items]      
Actuarial liabilities R$ 866,784 R$ 691,262 R$ 489,074