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Income taxes - Unrecognised deferred tax assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Unrecognised deferred tax assets [line items] |  |
Deductible temporary differences, basis | $ 2,866 | $ 2,550
Unused tax credits, basis | 0 | 0
Tax losses carried forward, basis | 23,434 | 18,259
Total unrecognised deferred tax assets, basis | 26,300 | 20,809
Deductible temporary differences, unrecognised deferred tax asset | 1,204 | 1,138
Unused tax credits | 212 | 0
Tax losses carried forward, unrecognised deferred tax asset | 5,677 | 4,366
Total unrecognised deferred tax assets | $ 7,093 | 5,504
Percentage of unrecognised tax losses that can be carried forward indefinitely | 14.00% |
Remaining unrecognised tax losses expiry date | The majority of the remaining part of the unrecognised tax losses expire after 2031. |
United States [member] |  |
Unrecognised deferred tax assets [line items] |  |
Total unrecognised deferred tax assets | $ 4,649 | 3,788
Angola [member] |  |
Unrecognised deferred tax assets [line items] |  |
Total unrecognised deferred tax assets | $ 740 | $ 833

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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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + Details
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