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Financial instruments - additional disclosures - Activity in level 3 financial assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance as of January 1 | $ 3,071 |
Balance as of December 31 | 3,605 | $ 3,071
Measured at FVOCI [member] |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance as of January 1 | 31 |
Balance as of December 31 | 28 | 31
Measured at FVPL [member] |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance as of January 1 | 184 |
Balance as of December 31 | 164 | 184
Financial investments [member] | Measured at FVOCI [member] |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance as of January 1 | 31 |
Balance as of December 31 | 28 | 31
Financial investments [member] | Measured at FVPL [member] |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance as of January 1 | 28 |
Balance as of December 31 | 12 | 28
Financial investments [member] | Level 3 [member] | Measured at FVOCI [member] |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance as of January 1 | 31 | 19
Additions | 7 | 17
Sales | 0 | 0
(Losses) recognized in consolidated statement of comprehensive loss | (10) | (7)
Unrealized gains/(losses) in consolidated income statement | 0 | 0
Amortization | 0 | 0
Reclassification | 0 | 2
Balance as of December 31 | 28 | 31
Financial investments [member] | Level 3 [member] | Measured at FVPL [member] |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance as of January 1 | 61 | 98
Additions | 2 | 34
Sales | 0 | (7)
(Losses) recognized in consolidated statement of comprehensive loss | 0 | 0
Unrealized gains/(losses) in consolidated income statement | (5) | (3)
Amortization | (34) | (61)
Reclassification | 0 | 0
Balance as of December 31 | $ 24 | $ 61

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- Definition Reclassification, Fair Value Measurement, Assets + References No definition available. + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35H&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35I&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35M&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35N&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_ii&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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