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Schedule of consortium (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Total R$ 93 R$ 103
[custom:Total2] 93 101
Total 2
Usina De Queimado [Member]    
IfrsStatementLineItems [Line Items]    
Stake in power output (%) 82.50%  
Average annual depreciation rate (%) 3.94%  
Total R$ 220 218
Accumulated Depreciation [Member]    
IfrsStatementLineItems [Line Items]    
Total R$ (127) (117)
Usina De Queimado 1 [Member]    
IfrsStatementLineItems [Line Items]    
Stake in power output (%) 82.50%  
Total R$ 2