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Financial instruments - Liquidity risk management (Details) - Liquidity risk [member] - BRL (R$) R$ in Thousands	Sep. 30, 2025	Dec. 31, 2024
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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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
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