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v3.20.4

Deferred tax assets and liabilities - Additional information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unremitted earnings retained for reinvestment | $ 7,000,000,000 |  |
Temporary differences and unused tax losses for which no deferred tax assets were recognized | 9,000,000,000 | $ 9,000,000,000 |
Tax loss carryforwards capitalized | 921,000,000 | 521,000,000 |
Tax loss carryforwards expiring in five years | 5,000,000 |  |
Expiring in greater than five years or with indefinite carryforward period | 916,000,000 |  |
Amount with indefinite carryforward period | 559,000,000 |  |
Expiring in 6 to 20 years | 357,000,000 |  |
Tax loss carryforwards expired in period | $ 0 | 0 | $ 0
Switzerland [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes |  | $ 304,000,000 |

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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