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The net exposure to exchange rates is as follows: (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Total R$ 2
Foreign [Member]    
IfrsStatementLineItems [Line Items]    
Loans and financing (note 22) (1,008) (1,514)
Suppliers (Itaipu Binacional) (note 20) (59) (63)
Total (1,067) (1,577)
Domestic [Member]    
IfrsStatementLineItems [Line Items]    
Loans and financing (note 22) (5,623) (7,866)
Suppliers (Itaipu Binacional) (note 20) (331) (325)
Total (5,954) (8,191)
Net liabilities exposed R$ (5,954) R$ (8,191)