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Financial instruments - Reconciliation of changes in fair value (Details) - Level 3 [member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of fair value measurement [line items] |  |
Opening balance | $ 510 | $ 485
Total gains and losses recognised in statement of income, assets | 109 | 4
Purchases, assets | 64 | 78
Settlement, assets | (36) | (52)
Transfer to level 1 | 1 | (3)
Foreign currency translation differences | 9 | (3)
Closing balance | 657 | 510
Non-current derivative financial instruments liabilities [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | (19) | (35)
Total gains and losses recognised in statement of income, liabilities | 14 | 16
Foreign currency translation differences | 0 |
Closing balance | (5) | (19)
Current derivative financial Instruments, liabilities [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 0 | (1)
Total gains and losses recognised in statement of income, liabilities | 0 | 1
Foreign currency translation differences | 0 |
Closing balance | 0 | 0
Non-current financial investments [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 277 | 250
Total gains and losses recognised in statement of income, assets | (29) | (38)
Purchases, assets | 64 | 78
Settlement, assets | (8) | (11)
Transfer to level 1 | 1 | (3)
Foreign currency translation differences | 4 | 0
Closing balance | 308 | 277
Non-current derivative financial instruments - assets [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 219 | 227
Total gains and losses recognised in statement of income, assets | 106 | (6)
Foreign currency translation differences | 5 | (2)
Closing balance | 330 | 219
Current derivative financial instruments, assets [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 33 | 44
Total gains and losses recognised in statement of income, assets | 19 | 31
Purchases, assets |  | 0
Settlement, assets | (28) | (42)
Transfer to level 1 |  | 0
Foreign currency translation differences | 0 | 0
Closing balance | $ 24 | $ 33

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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 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 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 2019-01-01 -Paragraph IG20B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 + Details
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