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Schedule of concession contracts (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Concession Contract One [Member]    
IfrsStatementLineItems [Line Items]    
Current consideration R$ 27 R$ 19
Non current consideration 89 91
Concession Contract Two [Member]    
IfrsStatementLineItems [Line Items]    
Current consideration 39 29
Non current consideration 152 133
Concession Contract Three [Member]    
IfrsStatementLineItems [Line Items]    
Current consideration 7
Non current consideration 74
National Grid R B S E [Member]    
IfrsStatementLineItems [Line Items]    
Current consideration 318 533
Non current consideration 1,694 1,363
National Grid Facilities R B N I [Member]    
IfrsStatementLineItems [Line Items]    
Current consideration 209 156
Non current consideration 1,749 1,421
[custom:ConcessionConsideration-0] 4,358 3,745
Current [member]    
IfrsStatementLineItems [Line Items]    
Current consideration 600 737
Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Non current consideration R$ 3,758 R$ 3,008