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Financial instruments - Fair value of loans and financing (Details) - Loans, financing and debentures - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value R$ 98,802,972 R$ 75,703,064
Bonds | Foreign countries | Fixed    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal Secondary Market  
Financial liabilities, at fair value R$ 48,734,909 38,703,379
Export credits (“export prepayments”) | Foreign countries | SOFR    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal SOFR  
Financial liabilities, at fair value R$ 22,740,891 17,783,760
Export credits (“export prepayments”) | Country of domicile | Fixed    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value 824,035
Assets Financing | Foreign countries | SOFR    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal SOFR  
Financial liabilities, at fair value R$ 422,115 278,107
Assets Financing | Country of domicile | SOFR    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value R$ 60,566 75,622
ECA - Export Credit Agency | Foreign countries | SOFR    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal SOFR  
Financial liabilities, at fair value R$ 864,202
IFC - International Finance Corporation | Foreign countries | SOFR    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal SOFR  
Financial liabilities, at fair value R$ 6,261,715 3,198,761
Panda Bonds (1) | Foreign countries | Fixed    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal Fixed  
Financial liabilities, at fair value R$ 951,125
BNDES – TJLP [Member] | Country of domicile | BNDES – TJLP    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value R$ 171,109 215,458
BNDES – TLP [Member] | Country of domicile | BNDES – TLP    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value R$ 3,275,012 2,712,762
BNDES | Country of domicile | Fixed    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value 3,903
BNDES | Country of domicile | BNDES – SELIC    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value R$ 645,139 686,798
BNDES – TR | Country of domicile | BNDES – TR    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value R$ 33,466
BNDES - US$ | Country of domicile | BNDES - US$    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 2  
Financial liabilities, at fair value R$ 106,966
Debentures | Country of domicile | CDI/IPCA    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1/IPCA  
Financial liabilities, at fair value R$ 12,002,992 8,881,277
NCE ("Export Credit Notes") | Country of domicile | CDI    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value R$ 108,308 110,396
NCR ("Rural Credit Notes") | Country of domicile | CDI    
Disclosure of detailed information about financial instruments [line items]    
Description of valuation techniques used to measure fair value less costs of disposal DI 1  
Financial liabilities, at fair value R$ 2,424,457 R$ 2,228,806