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Financial instruments - Short and Long-term investments (Details)
R$ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2023
BRL (R$)
R$ / shares
shares
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
Disclosure of detailed information about financial instruments [line items]      
Short-term R$ 3,481,496 R$ 3,453,772  
Long-term 45,702 214,765  
Investments 3,527,198 3,668,537  
Change in fair value in OCI 1,912 (6,971) R$ 216,466
Bonds      
Disclosure of detailed information about financial instruments [line items]      
Investments 2,954,236 926,559  
Structured notes linked to LFTs      
Disclosure of detailed information about financial instruments [line items]      
Investments 473,259 2,176,019  
Corporate bonds      
Disclosure of detailed information about financial instruments [line items]      
Investments 51,933 349,540  
Equity securities      
Disclosure of detailed information about financial instruments [line items]      
Investments R$ 45,702 214,765  
Number of shares sold | shares 16.8    
Total consideration per share (in R$ per share) | R$ / shares 12.96    
Delivery of shares R$ 218,105    
Gains (losses) on financial assets at fair value through profit or loss 30,574 853,056  
Change in fair value in OCI   6,971  
Investment funds      
Disclosure of detailed information about financial instruments [line items]      
Investments 2,068 1,654  
Listed securities      
Disclosure of detailed information about financial instruments [line items]      
Short-term 3,006,169 1,276,099  
Long-term 0 182,139  
Listed securities | Bonds      
Disclosure of detailed information about financial instruments [line items]      
Short-term 2,954,236 926,559  
Long-term 0 0  
Listed securities | Structured notes linked to LFTs      
Disclosure of detailed information about financial instruments [line items]      
Short-term 0 0  
Long-term 0 0  
Listed securities | Corporate bonds      
Disclosure of detailed information about financial instruments [line items]      
Short-term 51,933 349,540  
Long-term 0 0  
Listed securities | Equity securities      
Disclosure of detailed information about financial instruments [line items]      
Short-term 0 0  
Long-term 0 182,139  
Listed securities | Investment funds      
Disclosure of detailed information about financial instruments [line items]      
Short-term 0 0  
Long-term 0 0  
Unlisted securities      
Disclosure of detailed information about financial instruments [line items]      
Short-term 475,327 2,177,673  
Long-term 45,702 32,626  
Unlisted securities | Bonds      
Disclosure of detailed information about financial instruments [line items]      
Short-term 0 0  
Long-term 0 0  
Unlisted securities | Structured notes linked to LFTs      
Disclosure of detailed information about financial instruments [line items]      
Short-term 473,259 2,176,019  
Long-term 0 0  
Unlisted securities | Corporate bonds      
Disclosure of detailed information about financial instruments [line items]      
Short-term 0 0  
Long-term 0 0  
Unlisted securities | Equity securities      
Disclosure of detailed information about financial instruments [line items]      
Short-term 0 0  
Long-term 45,702 32,626  
Unlisted securities | Investment funds      
Disclosure of detailed information about financial instruments [line items]      
Short-term 2,068 1,654  
Long-term R$ 0 R$ 0