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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

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