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Schedule of fair value of derivative hedge instrument One (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Total R$ 2
Total 93 R$ 101
Income and Social Contribution taxes on restatement of defined benefit plans    
IfrsStatementLineItems [Line Items]    
Loans and financings (note 22) (5,623)  
Suppliers (Itaipu Binacional) (note 20) (331)  
Total (5,954)  
Net liabilities exposed (5,954)  
Probable Scenario [Member]    
IfrsStatementLineItems [Line Items]    
Loans and financings (note 22) (5,139)  
Suppliers (Itaipu Binacional) (note 20) (303)  
Total (5,442)  
Net liabilities exposed (5,442)  
Net effect of exchange rate fluctuation 512  
Possible Scenario Appreciation [Member]    
IfrsStatementLineItems [Line Items]    
Loans and financings (note 22) (6,429)  
Suppliers (Itaipu Binacional) (note 20) (378)  
Total (6,807)  
Net liabilities exposed (6,807)  
Net effect of exchange rate fluctuation (853)  
Remote Scenario Appreciation [Member]    
IfrsStatementLineItems [Line Items]    
Loans and financings (note 22) (7,709)  
Suppliers (Itaipu Binacional) (note 20) (454)  
Total (8,163)  
Net liabilities exposed (8,163)  
Net effect of exchange rate fluctuation R$ (2,209)