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Post-Employment Obligations - Schedule of Income Statement (Details) R$ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 BRL (R$)	Dec. 31, 2022 BRL (R$)	Dec. 31, 2021 BRL (R$)
IfrsStatementLineItems [Line Items]
Current service cost		R$ 11	R$ 18	R$ 27
Past service cost		(56)	(4)	(415)
Interest on the actuarial obligation			1,592	1,159
Estimated total expense in 2020 as per actuarial report		(352)	(696)	(302)
Pension Plans And Retirement Supplement Plan [Member]
IfrsStatementLineItems [Line Items]
Current service cost			2	2
Past service cost			(4)
Interest on the actuarial obligation		1,276	1,224	883
Expected return on the assets of the Plan		(1,004)	(941)	(685)
Estimated total expense in 2020 as per actuarial report		272	281	200
Health Plans [Member]
IfrsStatementLineItems [Line Items]
Current service cost		11	16	21
Past service cost		(55)
Interest on the actuarial obligation		370	361	232
Estimated total expense in 2020 as per actuarial report		326	377	253
Total [Member]
IfrsStatementLineItems [Line Items]
Current service cost	$ 7	11	18	27
Past service cost		(56)	(4)	(415)
Interest on the actuarial obligation	1,322	1,653	1,592	1,159
Expected return on the assets of the Plan	(842)	(1,004)	(941)	(685)
Estimated total expense in 2020 as per actuarial report	$ 487	604	665	86
Dental Plans [Member]
IfrsStatementLineItems [Line Items]
Current service cost				1
Past service cost		(1)
Interest on the actuarial obligation		7	7	5
Estimated total expense in 2020 as per actuarial report		R$ 6	R$ 7	6
Life Insurance Plans [Member]
IfrsStatementLineItems [Line Items]
Current service cost				3
Past service cost				(415)
Interest on the actuarial obligation				39
Estimated total expense in 2020 as per actuarial report				R$ (373)

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- Definition

Ifrs Statement Line Items

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Past Service Cost

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
-Subparagraph c
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_iii&doctype=Standard
-URIDate 2023-03-23

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_a&doctype=Standard
-URIDate 2023-03-23

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_b&doctype=Standard
-URIDate 2023-03-23

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_i&doctype=Standard
-URIDate 2023-03-23

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