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9. RECOVERABLE TAXES (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current R$ 99 R$ 124
Recoverable taxes, non-current 6,349 242
Recoverable taxes 6,448 366
ICMS (VAT) [Member]    
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current 65 80
Recoverable taxes, non-current 277 240
PIS/PasepTaxes [member]    
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current 3 4
Recoverable taxes, non-current 1,102  
Cofins tax [Member]    
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current 7 21
Recoverable taxes, non-current 4,968  
Other Tax Recoverable [Member]    
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current 24 19
Recoverable taxes, non-current R$ 2 R$ 2