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9. RECOVERABLE TAXES (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current R$ 1,850 R$ 99 [1]
Recoverable taxes, non-current 3,442 6,349 [1]
Recoverable taxes 5,292 6,448
ICMS (VAT) [member]    
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current 97 65
Recoverable taxes, non-current 257 277
PIS/PasepTaxes [member]    
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current 311 3
Recoverable taxes, non-current 588 1,102
Cofins [member]    
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current 1,426 7
Recoverable taxes, non-current 2,594 4,968
Other Tax Recoverable [member]    
Disclosure of recoverable taxes [line items]    
Recoverable taxes, current 16 24
Recoverable taxes, non-current R$ 3 R$ 2
[1] See note 2.8.