Employee benefits (Details 6) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
IfrsStatementLineItems [Line Items]
Present value of obligations at the beginning of the year	$ 30,766	$ 23,805
Recognized in the Statement of Income	4,119	3,049
Interest expense	2,618	2,882
Service cost	1,501	167
Recognized in Equity - other comprehensive income	(4,620)	3,986
Remeasurement: Experience (gains) / losses (2)	(267)	(465)
Remeasurement: (gains) / losses - demographic assumptions	8	1,135
Remeasurement: (gains) / losses - financial assumptions (2)	(4,361)	3,316
Others	(8,668)	(74)
Benefits paid, net of assisted contributions	(1,920)	(2,052)
Contributions paid by participants	45	40
Translation Adjustment	(6,793)	1,938
Present value of obligations at the end of the year	21,597	30,766
Pension Plans PPSP-R [member]
IfrsStatementLineItems [Line Items]
Present value of obligations at the beginning of the year	14,941	12,771
Recognized in the Statement of Income	1,241	1,559
Interest expense	1,231	1,548
Service cost	10	11
Recognized in Equity - other comprehensive income	(1,949)	737
Remeasurement: Experience (gains) / losses (2)	(8)	(318)
Remeasurement: (gains) / losses - demographic assumptions		929
Remeasurement: (gains) / losses - financial assumptions (2)	(1,941)	126
Others	(4,241)	(126)
Benefits paid, net of assisted contributions	(999)	(1,165)
Contributions paid by participants	24	25
Translation Adjustment	(3,266)	1,014
Present value of obligations at the end of the year	9,992	14,941
Pension Plans PPSP-NR [member]
IfrsStatementLineItems [Line Items]
Present value of obligations at the beginning of the year	4,806	4,119
Recognized in the Statement of Income	397	496
Interest expense	395	494
Service cost	2	2
Recognized in Equity - other comprehensive income	(577)	274
Remeasurement: Experience (gains) / losses (2)	15	(107)
Remeasurement: (gains) / losses - demographic assumptions		80
Remeasurement: (gains) / losses - financial assumptions (2)	(592)	301
Others	(1,393)	(83)
Benefits paid, net of assisted contributions	(354)	(413)
Contributions paid by participants	5	6
Translation Adjustment	(1,044)	324
Present value of obligations at the end of the year	3,233	4,806
Pension Plans Petros 2 [member]
IfrsStatementLineItems [Line Items]
Present value of obligations at the beginning of the year	1,357	1,102
Recognized in the Statement of Income	112	141
Interest expense	112	131
Service cost		10
Recognized in Equity - other comprehensive income	(233)	73
Remeasurement: Experience (gains) / losses (2)	190	(94)
Remeasurement: (gains) / losses - demographic assumptions	7	(1)
Remeasurement: (gains) / losses - financial assumptions (2)	(430)	168
Others	(362)	41
Benefits paid, net of assisted contributions	(79)	(61)
Contributions paid by participants	16	9
Translation Adjustment	(299)	93
Present value of obligations at the end of the year	874	1,357
Health Care Plan Saude Petrobras [Member]
IfrsStatementLineItems [Line Items]
Present value of obligations at the beginning of the year	9,662	5,813
Recognized in the Statement of Income	2,369	853
Interest expense	880	709
Service cost	1,489	144
Recognized in Equity - other comprehensive income	(1,861)	2,902
Remeasurement: Experience (gains) / losses (2)	(464)	54
Remeasurement: (gains) / losses - demographic assumptions	1	127
Remeasurement: (gains) / losses - financial assumptions (2)	(1,398)	2,721
Others	(2,672)	94
Benefits paid, net of assisted contributions	(488)	(413)
Contributions paid by participants
Translation Adjustment	(2,184)	507
Present value of obligations at the end of the year	$ 7,498	$ 9,662

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
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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 2024-01-01
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The increase (decrease) in reimbursement rights related to defined benefit obligation, resulting from the remeasurement of reimbursement rights. [Refer: Reimbursement rights related to defined benefit obligation, at fair value]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
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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 2024-01-01
-Paragraph 141
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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

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Benefits paid fair value of plan assets.

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