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Equity and Remuneration to Shareholders - Additional Information (Details) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Dec. 14, 2023
Sep. 20, 2023
Jun. 20, 2023
Mar. 22, 2023
Apr. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]                
Share capital           R$ 11,007 R$ 11,007  
Issuance of shares           2,201,370,688 2,201,370,688 1,693,362,068
Profit reserve exceed share capital           R$ 986    
Earning per share (in dollars per share)           R$ 2.62 R$ 1.86  
Net profit share           R$ 4,836    
Payment of the minimum mandatory dividends on preferred shares           733    
Unrealized profit reserve         R$ 6 R$ 835    
Right to percentage reduction in income tax           75.00%    
Incentive tax reserve benefit period           10 years    
Incentive tax reserve benefit renewed period           10 years    
Incentives tax reserve           R$ 63 R$ 26  
Prior periods adjustments         R$ 835      
Description of allocation of net income         R$288 was held in Stockholders’ equity in the Legal Reserve, as established in Brazilian corporate Law 6,404/1976.      
Description of allocation of net income         R$3,124 as minimum mandatory dividends, to the Company’s shareholders, to be paid in two equal installments, by June 30 and December 30, 2024, as follows:      
Income tax amount           R$ 1,084 26 R$ 946
Maximum increase in share capital           10.00%    
Percentage of net income corresponds to reserve constitution           5.00%    
Net income for the year           R$ 5,764 4,092 3,751
Interest on own equity           2,591    
Retained earnings reserve           0 0 0
Tax incentives reserve (Note 26)           0 0 0
Dividends to holders           533    
Health plan [member]                
IfrsStatementLineItems [Line Items]                
Actuarial gain on benefit plan           60    
Dental Plan [Member]                
IfrsStatementLineItems [Line Items]                
Actuarial gain on benefit plan           1    
Sudene [Member]                
IfrsStatementLineItems [Line Items]                
Tax incentives reserve (Note 26)           63    
Chief Executive Officer [Member]                
IfrsStatementLineItems [Line Items]                
Amount of remuneration R$ 1,323 R$ 418 R$ 427 R$ 424   R$ 2,592    
Equity interest rate           15.00%    
Retained earnings [member]                
IfrsStatementLineItems [Line Items]                
Retained earnings reserve           R$ 2,295 1,756 1,552
Tax incentives reserve (Note 26)           R$ (63) R$ (26) R$ (21)
Common Shares [Member]                
IfrsStatementLineItems [Line Items]                
Issuance of shares           735,847,624 735,847,624 566,036,634
Preference shares [member]                
IfrsStatementLineItems [Line Items]                
Issuance of shares           1,465,523,064 1,465,523,064 1,127,325,434
Number of shares issued           439,656,920    
Ordinary shares [member]                
IfrsStatementLineItems [Line Items]                
Nominal Value           R$ 5 R$ 5  
Number of shares issued           220,754,287