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Commitments - Guarantees provided (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Commitments |  |  |
Fair value of guarantee recorded in Other non-current liabilities | $ 468 | $ 353 | $ (23)
Certain associates and joint ventures |  |  |
Commitments |  |  |
Fair value of guarantee recorded in Other non-current liabilities | 877 | 525 |
Financial guarantees provided | $ 1,557 | $ 1,655 |

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- Definition The amount of related-party commitments made by the entity to do something if a particular event occurs or does not occur in the future, including executory contracts (recognised and unrecognised). [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_21_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of guarantees or collateral provided by the entity in related party transactions. [Refer: Guarantees [member]; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_21_h&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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