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Financial instruments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Gains (losses) on change in fair value of derivatives | $ 473 | $ (341) | $ (61)
Gains (losses) financial investments | 245 | (72) | $ 108
Level 3 [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Gains (losses) on change in fair value of derivatives | 25 |  |
Total gains and losses recognised in statement of income, assets | 4 | (122) |
Portion agreed and settled | 52 | $ 36 |
Level 3 [member] | Certain earn-out agreements [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Gains (losses) on change in fair value of derivatives | 24 |  |
Portion fully realised | $ 42 |  |

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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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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- Definition The decrease in the fair value measurement of assets resulting from sales. [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 iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease in the fair value measurement of assets resulting from settlements. [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 iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2019-03-27 + Details
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