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Schedule of electricity purchased for resale (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Energy purchased for resale R$ 16,101 R$ 12,111 R$ 11,286
Supply From Itaipu Binacional [Member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 1,946 1,990 1,429
Physical Guarantee Quota Contracts [Member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 832 780 715
Quotas For Angra I And I I Nuclear Plants [Member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 244 303 269
Spot Market [Member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 1,224 1,497 1,886
Proinfa program [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 401 318 376
bilateral contracts [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 418 333 311
Energy Acquired In Regulated Market Auctions [Member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 6,242 3,334 3,021
Energy Acquired In The Free Market [Member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 4,976 3,977 4,098
Distributed Generation Geracao Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 1,268 678 207
P I S Pasep And Cofins Credits [Member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale R$ (1,450) R$ (1,099) R$ (1,026)