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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Information whether recoverable amount of asset is fair value less costs of disposal or value in use | The recoverable amounts of the CGUs, or groups of CGUs, have been determined from value in use calculations. |  |
Description of key assumptions on which management has based cash flow projections | The key assumptions are RevPAR growth and the expected recovery period (detailed on page 149 within ‘Going concern’), terminal growth rates and pre-tax discount rates. |  |
Description of growth rates used to extrapolate cash flow projections | terminal growth rates that do not exceed the average long-term growth rates for the relevant markets |  |
Description of discount rates of applied to cash flow projections | pre-tax rates that are based on the Group’s weighted average cost of capital and incorporate adjustments reflecting risks specific to the territory of the CGU. |  |
Gain loss on disposal of software assets | $ 8 |  |
System fund gain or loss |  | $ 4 |
Cash-generating units [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment Charge | $ 0 |  |
Impairment testing of goodwill and brands (excluding the UK portfolio) [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Explanation of period over which management has projected cash flows | five-year |  |
Management agreements [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Weighted average remaining amortisation period | 17 years | 18 years |
Six Senses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment Charge |  | $ 41 |
Kimpton Management Agreements [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Discount rate for cash flow projections |  |  | 8.00%
Impairment Charge |  | 5 | $ 50
Kimpton Regent and Six Senses management agreement portfolios [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment Charge |  | 48 |
Description of basis on which unit's recoverable amount has been determined | valued at the higher of value in use and fair value less costs of disposal |  |
Computer software [member] | Costs Previously Incurred To Implement Cloud Computing Arrangements [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Gain loss on disposal of software assets | $ 12 |  |
Intangible asset material to entity [member] | Computer software [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill and other intangible assets | 233 |  |
Impairment Charge | 0 |  |
System fund impairment charge intangible assets and goodwill |  | 4 |
Intangible asset material to entity [member] | Computer software [member] | Internally generated [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill and other intangible assets | $ 155 |  |
Intangible asset material to entity [member] | Computer software [member] | Remaining Project Value [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Weighted average amortisation period | 5 years |  |
Intangible asset material to entity [member] | Computer software [member] | Phase 1 [Member] | Internally generated [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Weighted average amortisation period | 10 years |  |
Weighted average remaining period | 7 years |  |
Intangible asset material to entity [member] | Computer software [member] | Phase 2 [Member] | Internally generated [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Weighted average amortisation period | 8 years |  |
Weighted average remaining period | 7 years |  |
Brands [member] | Kimpton [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Acquisitions of intangible asset | $ 193 |  |
Brands [member] | Six Senses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Acquisitions of intangible asset | 189 |  |
Regent [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment Charge |  | $ 2 |
Regent [member] | Brands [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Acquisitions of intangible asset | $ 57 |  |

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- Definition The description of key assumptions on which management has based its cash flow projections for the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). Key assumptions are those to which the unit's (group of units') recoverable amount is most sensitive. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 134 -Subparagraph d -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_d_i&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 135 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_135_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The explanation of the period over which management has projected cash flows based on financial budgets/forecasts approved by management including, when a period greater than five years is used for a cash-generating unit (group of units), an explanation of why that longer period is justified. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 134 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_d_iii&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 134 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_e_iii&doctype=Standard -URIDate 2021-03-24 + Details
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