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18. INVESTMENTS (Details 9) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets        
Cash and cash equivalents R$ 536 R$ 891    
Total, current assets 10,138 27,796    
Contract assets 2,005 1,729  
Concession intangible assets 11,624 10,777 R$ 11,156 R$ 10,820
TOTAL NON-CURRENT 39,788 32,059    
Liabilities        
TOTAL CURRENT 7,913 23,394    
Provisions 1,888 641    
TOTAL NON-CURRENT 26,122 R$ 20,522    
At Fair Value [Member]        
Assets        
Cash and cash equivalents 27      
Other current assets 2      
Total, current assets 29      
TOTAL NON-CURRENT 108      
Contract assets and Right to exploitation of the regulated activity 108      
Liabilities        
Loans and financings 3      
Interest on equity and dividends payable 2      
Other current liabilities 1      
TOTAL CURRENT 6      
Loans and financings 8      
Provisions 3      
TOTAL NON-CURRENT 11      
Fair value of net identifiable assets R$ 120