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Changes in balances of these sector assets and liabilities: (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Concession Financial And Sector Assets And Liabilities      
Beginning balance R$ (98) R$ 882 R$ 1,080
Additions 1,908 611 724
Amortization 238 (156) (666)
Payments from the Flag Tariff Centralizing Account   (63) (361)
Updating - Selic rate (Note 31) 64 32 105
Receipt funds of ''Covid-account''   (1,404)  
Transfer of other liabilities (15)    
Ending balance R$ 2,097 R$ (98) R$ 882