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Income taxes - Unrecognised deferred tax assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences, basis | $ 2,900 | $ 2,866
Unused tax credits, basis | 0 | 0
Tax losses carried forward, basis | 20,552 | 23,434
Total unrecognised deferred tax assets, basis | 23,452 | 26,300
Deductible temporary differences, unrecognised deferred tax asset | 1,203 | 1,204
Unused tax credits | 264 | 212
Tax losses carried forward, unrecognised deferred tax asset | 5,047 | 5,677
Total unrecognised deferred tax assets | $ 6,514 | 7,093
Percentage of unrecognised tax losses that can be carried forward indefinitely | 22.00% |
Remaining unrecognised tax losses expiry date | after 2032 |
United States [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Total unrecognised deferred tax assets | $ 4,206 | 4,649
Angola [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Total unrecognised deferred tax assets | $ 749 | $ 740

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- Definition Unrecognised deferred tax assets on temporary differences. + References No definition available. + Details
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- Definition Perecentage of unrecognised carry forward tax losses which can be carried forward indefinitely. + References No definition available. + Details
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- Definition Unrecognised deferred tax assets on tax losses carried forward. + References No definition available. + Details
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- Definition Unrecognised deferred tax assets related to temporary differences and tax loss carry forward + References No definition available. + Details
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- Definition The amount of total deferred tax assets basis for which no deferred tax has been recognized. + References No definition available. + Details
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- Definition Unrecognised deferred tax assets on unused tax credits. + References No definition available. + Details
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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The description of the expiry date (if any) of deductible temporary differences, unused tax losses and unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
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