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22. LOANS, FINANCING AND DEBENTURES (Detaills 6) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
DisclosureLoansFinancingsAndDebenturesLineItems [Line Items]      
Costs of loans and financing R$ 1,211    
Financing costs on intangible assets and contract assets [1] (33)    
Net effect in Profit or loss R$ 1,178    
Restated [member]      
DisclosureLoansFinancingsAndDebenturesLineItems [Line Items]      
Costs of loans and financing   R$ 1,250 R$ 1,287
Financing costs on intangible assets and contract assets [1]   (23) (30)
Net effect in Profit or loss   R$ 1,227 R$ 1,257
[1] The average capitalization rate p.a. in 2020 was 5.39% (6.79% in 2019 and 9.64% in 2018).