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Schedule of net liabilities in relation to its equity (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
Options in shares R$ 636 R$ 533    
Total liabilities 32,584 36,605    
Cash and cash equivalents 825 1,680    
Total equity 19,462 17,478 R$ 16,103 R$ 16,084
Capital management [member]        
IfrsStatementLineItems [Line Items]        
Total liabilities 32,584 36,605    
Cash and cash equivalents (825) (1,680)    
Restricted cash (19) (64)    
Net liabilities 31,740 34,861    
Total equity R$ 19,462 R$ 17,478    
Net liabilities / equity 1.62% 1.99%    
S A A G [Member]        
IfrsStatementLineItems [Line Items]        
Options in shares R$ 636 R$ 536    
Sonda [member]        
IfrsStatementLineItems [Line Items]        
Options in shares R$ (3)