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Information by operating segment (Details) - USD ($) $ in Millions | 12 Months Ended
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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) |

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- Definition 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] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_135_b&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount in the consolidated financial statements of the assets of the group to which significant restrictions (for example, statutory, contractual and regulatory restrictions) apply on the entity's ability to access or use the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2022-03-24 -Paragraph 13 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_13_c&doctype=Standard -URIDate 2022-03-24 + Details
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