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27. EMPLOYEE BENEFITS (Details 3) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Employee Benefits Details 3Abstract    
Fair value of plan assets, beginning R$ (3,305,356) R$ (3,193,493)
Interest income (327,830) (360,013)
Benefits paid 280,493 284,777
Expected return on plan assets (less interest income) (51,213) (36,627)
Fair value of plan assets, ending R$ (3,403,906) R$ (3,305,356)