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Financial instruments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Commodity price sensitivity [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Percentage of reasonably possible change, market risk | 30.00% |
Level 3 [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Total gains and losses recognised in statement of income, assets | $ 109 | $ 4
Gains on change in fair value of derivatives | 147 |
Level 3 [member] | Certain earn-out agreements [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Total gains and losses recognised in statement of income, assets | 28 |
Extrapolation approach [member] | Level 3 [member] | Certain earn-out agreements [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
The amount of increase (decrease) in the fair value of asset | $ 100 |

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- Definition The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2019-03-27 + Details
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