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Financial instruments and risk management - Classification (Details) - Financial risks management - BRL (R$)
R$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 39,736,825 R$ 37,168,630
Financial liabilities 113,049,522 127,361,288
Financial Liabilities, Net of Financial Assets 73,312,697 90,192,658
Financial liabilities at amortised cost, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 105,426,231 116,906,468
Financial liabilities at amortised cost, category [member] | Trade accounts payable    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 5,428,821 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 92,962,205 101,435,531
Financial liabilities at amortised cost, category [member] | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 6,845,742 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 96,801 120,490
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 1,992 2,200,917
Financial liabilities at amortised cost, category [member] | Other liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 90,670 143,330
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 7,623,291 10,454,820
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 7,623,291 10,454,820
Financial assets at amortised cost, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 22,606,296 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 15,838,866 9,018,818
Financial assets at amortised cost, category [member] | Trade accounts receivable    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 6,129,481 9,132,860
Financial assets at amortised cost, category [member] | Other assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 637,949 628,275
At fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 962,341 1,138,066
At fair value through other comprehensive income | Investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 962,341 1,138,066
At fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 16,168,188 17,250,611
At fair value through profit or loss | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 8,116,404 3,887,100
At fair value through profit or loss | Marketable securities    
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 8,051,784 R$ 13,363,511