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Stockholders' equity (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stockholders Equity        
Statutory net income R$ 29,695 R$ 26,236   R$ 18,961
Legal reserve (1,485) (1,312)   (948)
Dividend calculation basis 28,210 24,924   18,013
Mandatory dividend 7,053 6,231   R$ 4,503
Dividends and Interest on Capital Paid / Accrued R$ 8,368 R$ 6,231 R$ 4,503