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Financial instruments - Fair value of loans and financing (Details) - Loans, financing and debentures - BRL (R$)
R$ in Thousands
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value R$ 92,171,705 R$ 98,802,972
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$ 42,872,554 48,734,909
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$ 19,618,606 22,740,891
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 R$ 332,382
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$ 331,481 422,115
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$ 56,446 60,566
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$ 769,830 864,202
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$ 5,581,088 6,261,715
Panda Bonds - CNH [Member] | 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$ 907,067 951,125
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$ 136,792 171,109
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$ 3,530,603 3,275,012
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$ 616,896 645,139
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$ 36,792 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$ 109,980 106,966
Debentures [Member] | 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$ 11,866,426 12,002,992
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$ 106,600 108,308
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$ 5,298,162 R$ 2,424,457