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Assets and liabilities sold and held for sale - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assets and liabilities classified as held for sale [line items] |  |  |
Gain on Disposal of Assets and Liabilities Classified as Held For Sale | $ 16 | $ 21 | $ 14
Proceeds From Disposal Of Noncurrent Assets | 1 |  |
EMEAA [member] |  |  |
Assets and liabilities classified as held for sale [line items] |  |  |
Gain on Disposal of Assets and Liabilities Classified as Held For Sale | (3) |  |
Holiday Inn Melbourne Airport [member] | EMEAA [member] |  |  |
Assets and liabilities classified as held for sale [line items] |  |  |
Gain on Disposal of Assets and Liabilities Classified as Held For Sale | 3 |  |
Proceeds From Disposal Of Noncurrent Assets | $ 2 |  |

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- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The cash inflow from the disposal of non-current assets or disposal groups classified as held for sale and discontinued operations. [Refer: Discontinued operations [member]; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_16&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Disclosure Of Assets And Liabilitites Classified As Held For Sale + References No definition available. + Details
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- Details
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- Details
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