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Deferred tax assets and liabilities (Details 2) - USD ($) $ in Billions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investments in subsidiaries [member] |  |
Statement [line items] |  |
Temporary differences on which no deferred tax has been provided as they are permanent in nature | $ 5 | $ 3
Goodwill from acquisitions [member] |  |
Statement [line items] |  |
Deductible temporary differences for which no deferred tax liability is recognised | $ (27) | $ (24)

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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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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- References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |