Information by operating segment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
IfrsStatementLineItems [Line Items]
Net income (loss) for the year disclosed in 2020	$ 19,986	$ 948
Changes in the measurement
Net income (loss) for the year reclassified - 2020	19,986	948
Consolidated assets disclosed - 12.31.2021	174,348
Consolidated assets reclassified - 12.31.2021	174,348
Operating segments [member] \| Exploration And Production [Member]
IfrsStatementLineItems [Line Items]
Net income (loss) for the year disclosed in 2020	23,350	4,471
Changes in the measurement	(29)	40
Net income (loss) for the year reclassified - 2020	23,321	4,511
Consolidated assets disclosed - 12.31.2021	113,146
Changes in the measurement	(3,671)
Consolidated assets reclassified - 12.31.2021	109,475
Operating segments [member] \| Refining Transportation And Marketing [Member]
IfrsStatementLineItems [Line Items]
Net income (loss) for the year disclosed in 2020	5,746	77
Changes in the measurement	(121)	64
Net income (loss) for the year reclassified - 2020	5,625	141
Consolidated assets disclosed - 12.31.2021	34,388
Changes in the measurement	(3,782)
Consolidated assets reclassified - 12.31.2021	30,606
Operating segments [member] \| Gas And Power [Member]
IfrsStatementLineItems [Line Items]
Net income (loss) for the year disclosed in 2020	(109)	894
Changes in the measurement	(13)	2
Net income (loss) for the year reclassified - 2020	(122)	896
Consolidated assets disclosed - 12.31.2021	10,589
Changes in the measurement	(2,809)
Consolidated assets reclassified - 12.31.2021	7,780
Operating segments [member] \| Corporate And Other Business [Member]
IfrsStatementLineItems [Line Items]
Net income (loss) for the year disclosed in 2020	(7,291)	(4,898)
Changes in the measurement	163	(106)
Net income (loss) for the year reclassified - 2020	(7,128)	(5,004)
Consolidated assets disclosed - 12.31.2021	21,898
Changes in the measurement	9,020
Consolidated assets reclassified - 12.31.2021	30,918
Operating segments [member] \| Eliminations [Member]
IfrsStatementLineItems [Line Items]
Net income (loss) for the year disclosed in 2020	(1,710)	404
Changes in the measurement
Net income (loss) for the year reclassified - 2020	(1,710)	$ 404
Consolidated assets disclosed - 12.31.2021	(5,673)
Changes in the measurement	1,242
Consolidated assets reclassified - 12.31.2021	$ (4,431)

The amount of other comprehensive income, before tax, 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: Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions]

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