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Financial instruments - Liquidity risk management (Details) - Liquidity risk [member] - BRL (R$) R$ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | R$ 113,049,522 | R$ 127,361,288
Financial Liabilities, Undiscounted Cash Flows | 165,447,022 | 176,529,601
2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 16,540,519 | 24,896,300
2026 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 17,129,907 | 16,474,380
Later than two years and not later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 50,599,263 | 55,542,774
Later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 81,177,333 | 79,616,147
Trade accounts payable |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 5,428,821 | 6,033,285
Financial Liabilities, Undiscounted Cash Flows | 5,428,821 | 6,033,285
Trade accounts payable | 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 5,428,821 | 6,033,285
Trade accounts payable | Later than two years and not later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows |  |
Loans, financing and debentures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 92,962,205 | 101,435,531
Financial Liabilities, Undiscounted Cash Flows | 134,723,594 | 142,028,543
Loans, financing and debentures | 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 7,630,901 | 13,599,011
Loans, financing and debentures | 2026 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 15,055,057 | 14,235,170
Loans, financing and debentures | Later than two years and not later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 44,536,979 | 50,858,667
Loans, financing and debentures | Later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 67,500,657 | 63,335,695
Leases (1) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 6,845,742 | 6,972,915
Financial Liabilities, Undiscounted Cash Flows | 12,839,183 | 12,099,294
Leases (1) | 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 2,327,478 | 1,302,590
Leases (1) | 2026 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 1,201,940 | 1,176,832
Leases (1) | Later than two years and not later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 3,104,433 | 3,094,493
Leases (1) | Later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 6,205,332 | 6,525,379
Liabilities for assets acquisitions and subsidiaries |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 96,801 | 120,490
Financial Liabilities, Undiscounted Cash Flows | 112,326 | 146,082
Liabilities for assets acquisitions and subsidiaries | 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 19,239 | 23,425
Liabilities for assets acquisitions and subsidiaries | 2026 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 18,359 | 22,400
Liabilities for assets acquisitions and subsidiaries | Later than two years and not later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 74,728 | 100,257
Liabilities for assets acquisitions and subsidiaries | Later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows |  |
Derivative Liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 7,623,291 | 10,454,820
Financial Liabilities, Undiscounted Cash Flows | 12,250,436 | 13,878,150
Derivative Liabilities | 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 1,086,093 | 1,676,180
Derivative Liabilities | 2026 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 809,876 | 957,540
Derivative Liabilities | Later than two years and not later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 2,883,123 | 1,489,357
Derivative Liabilities | Later than five years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 7,471,344 | 9,755,073
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, Undiscounted Cash Flows | 1,992 | 2,200,917
Dividends and interests on own capital payable | 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 1,992 | 2,200,917
Other liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 90,670 | 143,330
Financial Liabilities, Undiscounted Cash Flows | 90,670 | 143,330
Other liabilities | 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | 45,995 | 60,892
Other liabilities | 2026 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities, Undiscounted Cash Flows | R$ 44,675 | R$ 82,438

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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 + Details
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