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Intangible assets - Exploration expenditures (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible exploration and evaluation assets | $ 1,958 | $ 2,261 |
Exploration expenditures | 1,027 | 1,371 | $ 1,584
Expensed exploration expenditures previously capitalised | 171 | 2,506 | 777
Capitalised exploration | (194) | (394) | (507)
Exploration expenses | 1,004 | 3,483 | $ 1,854
Less than one year [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible exploration and evaluation assets | 234 | 604 |
Between one and five years [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible exploration and evaluation assets | 692 | 623 |
More than five years [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible exploration and evaluation assets | $ 1,033 | $ 1,033 |

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- Definition Exploration expenses capitalised during the period. + References No definition available. + Details
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- Definition Reversal of exploration expenses previously capitalised as intangible assets. + References No definition available. + Details
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- Definition The amount of expense 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 -URIDate 2021-03-24 + Details
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- Definition The amount of exploration and evaluation assets recognised as intangible assets in accordance with the entity's accounting policy. [Refer: Exploration and evaluation assets [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 119 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_119&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash outflow for the purchase of exploration and evaluation assets. [Refer: Exploration and evaluation assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16&doctype=Standard -URIDate 2021-03-24 + Details
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