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Capital reserves (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investment-related donations and subsidies R$ 1,857 R$ 1,857 R$ 1,857
Goodwill on issuance of shares 394 394 394
Shares in treasury (1) (1) (1)
 Capital reserves and shares in Treasury R$ 2,250 R$ 2,250 R$ 2,250