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Financial instruments - Reconciliation of changes in fair value (Details) - Level 3 [member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of fair value measurement [line items] |  |
Opening balance | $ 485 | $ 713
Total gains and losses recognised in statement of income, assets | 4 | (122)
Puchases, assets | 78 | 35
Settlement, assets | (52) | (36)
Transfer to current portion, assets |  | (88)
Transfer to level 1 | (3) |
Foreign currency translation differences | (3) | (18)
Closing balance | 510 | 485
Non-current derivative financial instruments liabilities [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | (35) | 0
Total gains and losses recognised in statement of income, liabilities | 16 | (35)
Puchases, liabilities | 0 | 0
Settlement, liabilities | 0 | 0
Transfer into level 3 | 0 |
Foreign currency translation differences | 0 | 0
Closing balance | (19) | (35)
Current derivative financial Instruments, liabilities [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | (1) | (4)
Total gains and losses recognised in statement of income, liabilities | 1 | 3
Puchases, liabilities | 0 | 0
Settlement, liabilities | 0 | 0
Transfer into level 3 | 0 |
Foreign currency translation differences | 0 | 0
Closing balance | 0 | (1)
Non-current financial investments [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 250 | 397
Total gains and losses recognised in statement of income, assets | (38) | (91)
Puchases, assets | 78 | 35
Settlement, assets | (11) | 0
Transfer to current portion, assets |  | (88)
Transfer to level 1 | (3) |
Foreign currency translation differences | 0 | (3)
Closing balance | 277 | 250
Non-current derivative financial instruments - assets [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 227 | 283
Total gains and losses recognised in statement of income, assets | (6) | (44)
Puchases, assets | 0 | 0
Settlement, assets | 0 | 0
Transfer to current portion, assets |  | 0
Foreign currency translation differences | (2) | (13)
Closing balance | 219 | 227
Current derivative financial instruments, assets [Member] |  |
Disclosure of fair value measurement [line items] |  |
Opening balance | 44 | 37
Total gains and losses recognised in statement of income, assets | 31 | 46
Puchases, assets | 0 | 0
Settlement, assets | (42) | (36)
Transfer to current portion, assets |  | 0
Foreign currency translation differences | 0 | (3)
Closing balance | $ 33 | $ 44

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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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- 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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