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Reserve for mandatory dividends not distributed (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Dividends withheld, arising from the net income R$ 1,420 R$ 1,420 R$ 1,420
Dividends Withheld Arising From The Profit For 2015 [Member]      
IfrsStatementLineItems [Line Items]      
Dividends withheld, arising from the net income 623    
Dividends Withheld Arising From The Profit For 2014 [Member]      
IfrsStatementLineItems [Line Items]      
Dividends withheld, arising from the net income R$ 797