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This table provides the changes on dividends and interest on capital payable: (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Proposed dividends R$ (1,967) R$ 1,482 R$ 764
Change Dividend [Member]      
IfrsStatementLineItems [Line Items]      
Balances at December 31, 2020 1,449 744  
Proposed dividends 1,967 1,482  
Proposed dividends - Non-controlling interests 1 1  
Withholding income tax on interest on capital (91) (50)  
Dividends retained – Minas Gerais state government (Note 11) (13) (130)  
Dividends paid (1,403) (598)  
Balances at December 31, 2021 R$ 1,910 R$ 1,449 R$ 744