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Financial instruments and risk management - Classification (Details) - Financial risks management - BRL (R$)
R$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 34,844,680 R$ 37,168,630
Financial liabilities 110,288,186 127,361,288
Financial Liabilities, Net of Financial Assets 75,443,506 90,192,658
Financial liabilities at amortised cost, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 104,637,353 116,906,468
Financial liabilities at amortised cost, category [member] | Trade accounts payable    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 5,951,839 6,033,285
Financial liabilities at amortised cost, category [member] | Loans, financing and debentures    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 91,627,156 101,435,531
Financial liabilities at amortised cost, category [member] | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 6,787,997 6,972,915
Financial liabilities at amortised cost, category [member] | Liabilities for assets acquisitions and subsidiaries    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 112,535 120,490
Financial liabilities at amortised cost, category [member] | Dividends and interests on own capital payable    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 1,997 2,200,917
Financial liabilities at amortised cost, category [member] | Other liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 155,829 143,330
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 5,650,833 10,454,820
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 5,650,833 10,454,820
Financial assets at amortised cost, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 20,252,668 18,779,953
Financial assets at amortised cost, category [member] | Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 12,283,589 9,018,818
Financial assets at amortised cost, category [member] | Trade accounts receivable    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 7,287,028 9,132,860
Financial assets at amortised cost, category [member] | Other assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 682,051 628,275
At fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 931,722 1,138,066
At fair value through other comprehensive income | Investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 931,722 1,138,066
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 13,660,290 17,250,611
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 5,156,340 3,887,100
At fair value through profit or loss | Marketable securities    
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 8,503,950 R$ 13,363,511