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Financial instruments - Reconciliation of changes in fair value (Details) - Level 3 [member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of fair value measurement [line items] |  |
Opening balance | $ 657 | $ 510
Total gains and losses recognised in statement of income, assets | 108 | 109
Purchases, assets | 119 | 64
Settlement, assets | (27) | (36)
Transfer to level 1 | 0 | 1
Foreign currency translation differences | (13) | 9
Closing balance | 844 | 657
Non-current derivative financial instruments liabilities [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | (5) | (19)
Total gains and losses recognised in statement of income, liabilities | 1 | 14
Closing balance | (4) | (5)
Non-current financial investments [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 308 | 277
Total gains and losses recognised in statement of income, assets | (23) | (29)
Purchases, assets | 119 | 64
Settlement, assets | (7) | (8)
Transfer to level 1 | 0 | 1
Foreign currency translation differences | (3) | 4
Closing balance | 394 | 308
Non-current derivative financial instruments - assets [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 330 | 219
Total gains and losses recognised in statement of income, assets | 58 | 106
Foreign currency translation differences | (8) | 5
Closing balance | 380 | 330
Current derivative financial instruments, assets [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 24 | 33
Total gains and losses recognised in statement of income, assets | 72 | 19
Settlement, assets | (20) | (28)
Foreign currency translation differences | (2) | 0
Closing balance | $ 74 | $ 24

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- Definition The amount of transfers into Level 1 of the fair value hierarchy of liabilities held at the end of the reporting period. + References No definition available. + 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 2021-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in financial assets resulting from foreign exchange. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph IG20B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2021-03-24 + Details
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