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FINANCIAL INSTRUMENTS - Capital management risk (Details) - Capital management risk
R$ in Billions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Disclosure of objectives, policies and processes for managing capital [line items]  
Average maturity 6 years
Minimum  
Disclosure of objectives, policies and processes for managing capital [line items]  
Net debt/Adjusted EBITDA 1.0
Maximum  
Disclosure of objectives, policies and processes for managing capital [line items]  
Net debt/Adjusted EBITDA 1.5
Gross debt limit R$ 12