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Contractual Commitments - Assignment agreement of CAN 100 exploration permit (offshore) – Block E-1 Reconversion (Detail) - Can One Hundred Exploration Permit E One Conversion [Member] - Off Shore [Member] - Assignment Agreement [Member] - USD ($) $ in Millions					12 Months Ended
	Dec. 14, 2021	Jan. 14, 2021	Apr. 22, 2020	Oct. 08, 2019	Dec. 31, 2020
Statement [Line Items]
Proportion of ownership interest in joint operation				50.00%
Equinor [Member]
Statement [Line Items]
Proportion of ownership interest in joint operation		35.00%		50.00%
Cash flows received from the counterparty in respect of the exploration permit			$ 22
Equinor [Member] | Shell Argentina [Member]
Statement [Line Items]
Cash flows received from the counterparty in respect of the exploration permit		$ 5
Percentage Of Interest In Joint Operation Assigned		15.00%
Additional amount received in respect of the exploration permit	$ 5
Equinor [Member] | Other Net Operating Results [Member]
Statement [Line Items]
Income arising from exloration and evaluation of mineral resources					$ 1,457

X

- Definition

The cash flows from (used in) the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource, classified as operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 6
-IssueDate 2021-01-01
-Paragraph 24
-Subparagraph b
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-URIDate 2021-03-24

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- Definition

The amount of income arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources, after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 6
-IssueDate 2021-01-01
-Paragraph 24
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2021-en-r&anchor=para_24_b&doctype=Standard
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- Definition

The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2021-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2021-03-24

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