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33. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 14) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [line items]        
Total liabilities R$ 34,035 R$ 43,916    
Cash and cash equivalents (536) (891)    
Net assets (liabilities) exposed (922) (712)    
Total equity 15,891 15,939 R$ 14,330 R$ 12,934
Capital Management [Member]        
Disclosure of financial liabilities [line items]        
Total liabilities 34,035 43,916    
Cash and cash equivalents (536) (891)    
Restricted cash (12) (91)    
Net assets (liabilities) exposed 33,487 42,934    
Total equity R$ 15,891 R$ 15,939    
Net liabilities / equity 2.11% 2.70%