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Accounting policies - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Oct. 31, 2020 GBP (£) | Jun. 30, 2020 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 GBP (£) | Oct. 31, 2020 EUR (€) | Oct. 31, 2020 GBP (£) | Sep. 30, 2020 USD ($)
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation method, property, plant and equipment |  |  |  |  | All depreciation is charged on a straight-line basis |  |  |  |  |  |  |  |
Revenue |  |  |  |  | $ 2,394 | $ 4,627 | $ 4,337 |  |  |  |  |  |
Issuance of commercial paper | $ 819 |  |  |  | 819 |  |  |  |  | £ 600 |  |  |
Undrawn bank facilities | 1,400 |  |  |  | 1,400 | 1,279 |  |  |  |  |  |  |
Cash and cash equivalents | 1,675 |  |  |  | 1,675 | 195 | 704 |  |  |  |  |  |
Total liquidity | 2,925 |  |  |  | 2,925 |  |  |  |  |  |  |  |
Interest cover |  |  |  | 1.5 |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  | 7.5 |  |  |  |  |  |  |  |  |
Repayment of long-term bonds |  |  |  |  | 290 |  |  |  |  |  |  |  |
Deferred compensation plan investments | 236 |  |  |  | $ 236 | 218 | 193 |  |  |  |  |  |
Increase decease in sublease rentals |  |  |  |  | 8.00% |  |  |  |  |  |  |  |
Increase decease in sublease rentals of impairment charges |  |  |  |  | $ 2 |  |  |  |  |  |  |  |
Derivative financial instruments | (13) |  |  |  | (13) | (19) |  |  |  |  |  |  |
Gain loss recognized on put options |  |  |  |  | 4 |  |  |  |  |  |  |  |
Covenant Liquidity |  |  |  | $ 400 |  |  |  | $ 400 | $ 400 |  |  |  |
Option contract [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments | (4) |  |  |  | $ (4) |  |  |  |  |  |  |  |
Credit risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of provision on debt gross |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Increase decrease in expected credit loss |  |  |  |  | $ 4 |  |  |  |  |  |  |  |
Credit risk [member] | Past due more than 180 days [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in expected credit loss |  |  |  |  | $ 8 |  |  |  |  |  |  |  |
Percentage of collection rate |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Credit risk [member] | Change In Payment Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in expected credit loss |  |  |  |  | $ 2 |  |  |  |  |  |  |  |
Percentage of change in the expected collection rate |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Trade Deposits And Loans [Member] | Deposit Balance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Trade deposits and loans |  |  |  |  | $ 33 |  |  |  |  |  |  |  |
Trade Deposits And Loans [Member] | Associated Contract Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Trade deposits and loans |  |  |  |  | 33 |  |  |  |  |  |  |  |
One year Slower ReVPar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 4 |  |  |  |  |  |  |  |  |  |  |  |
One point Six Two Five PercentageFive hundred Million Euro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  |  |  |  |  |  | € 500 |  |
Bond interest rate |  |  |  |  |  |  |  |  |  |  | 1.625% | 1.625% |
Maturity date |  | 4 |  |  |  |  |  |  |  |  |  |  |
Three point Three Seven Five Percentage Four hundred Million Euro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | £ |  |  |  |  |  |  |  |  |  |  |  | £ 400 |
Bond interest rate |  |  |  |  |  |  |  |  |  |  | 3.375% | 3.375% |
Maturity date |  | 8 |  |  |  |  |  |  |  |  |  |  |
Three Point Eight Seven Five Percentage Four Hundred Million Euro Twenty Twenty two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | £ |  |  |  |  |  |  |  |  |  |  |  | £ 400 |
Bond interest rate |  |  |  |  |  |  |  |  |  |  | 3.875% | 3.875% |
Maturity date |  | November 2022 |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term bonds | £ |  | £ 227 |  |  |  |  |  |  |  |  |  |  |
Four To Five Year Period [Member] | One year Slower ReVPar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 12 |  |  |  |  |  |  |  |  |  |  |  |
Two To Three Year Period [Member] | One year Slower ReVPar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 11 |  |  |  |  |  |  |  |  |  |  |  |
North America Hotels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill |  |  | $ 35 |  |  |  |  |  |  |  |  |  |
Growth rate used to extrapolate cash flow projections |  |  | 1.70% |  |  |  |  |  |  |  |  |  |
North America Hotels [Member] | One year Faster Re V Par [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 9 |  |  |  |  |  |  |  |  |  |  |  |
US corporate headquarters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 13 |  |  |  |  |  |  |  |
US corporate headquarters [Member] | Americas Region [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 6 |  |  |  |  |  |  |  |
US corporate headquarters [Member] | Central [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 7 |  |  |  |  |  |  |  |
US corporate headquarters [Member] | Rental Lease [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 50 |  |  |  |  |  |  |  |  |  |  |  |
One percentage point increase [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 7 |  |  |  | 7 |  |  |  |  |  |  |  |
One percentage point increase in terminal capitalisation rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 8 |  |  |  |  |  |  |  |  |  |  |  |
One percentage point decrease in terminal capitalisation rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 11 |  |  |  |  |  |  |  |  |  |  |  |
Overdraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 1,575 |  |  |  | 1,575 |  |  |  |  |  |  |  |
Cash Flow Generated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 29 |  |  |  |  |  |  |  |
Levels of Existing Cash Reserves Available [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 800 |  |  |  | 800 |  |  |  |  |  |  |  |
UK Portfolio [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 50 |  |  |  |  |  |  |  |
Service Properties Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 66 |  |  |  |  |  |  |  |
Six Senses Management Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 41 |  |  |  |  |  |  |  |
Six Senses Management Agreements [Member] | Americas [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 5 |  |  |  |  |  |  |  |
Six Senses Management Agreements [Member] | EMEAA [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 33 |  |  |  |  |  |  |  |
Six Senses Management Agreements [Member] | Greater China [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 3 |  |  |  |  |  |  |  |
InterContinental Boston [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 32 |  |  |  |  |  |  |  |
UK Portfolio [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value gains losses on contingent purchase consideration |  |  |  |  | 21 |  |  |  |  |  |  |  |
Barclay and IC Boston [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 18 |  |  |  |  |  |  |  |
Loyalty programme liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, recognised in profit or loss, before tax, liabilities |  |  |  |  | 50 |  |  |  |  |  |  |  |
System Fund [member] | US corporate headquarters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 37 |  |  |  |  |  |  |  |
System Fund [member] | Loyalty programme liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | 1,245 |  |  |  | 1,245 | $ 1,233 | $ 1,181 |  |  |  |  |  |
Associates [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 13 |  |  |  |  |  |  |  |
Gain loss recognized on put options |  |  |  |  | $ 4 |  |  |  |  |  |  |  |
Software [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortisation method, intangible assets other than goodwill |  |  |  |  | straight-line |  |  |  |  |  |  |  |
Maximum [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalisation rate used to calculate the eventual sales value |  |  |  |  | 7.50% |  |  |  |  |  |  |  |
Covenant Liquidity |  |  |  |  |  |  |  |  |  |  |  |  | $ 400
Maximum [member] | North America Hotels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | 8 |  |  |  | $ 4 |  |  |  |  |  |  |  |
Growth rate used to extrapolate cash flow projections |  |  | 12.00% |  |  |  |  |  |  |  |  |  |
Capitalisation rate used to calculate the eventual sales value |  |  | 9.00% |  |  |  |  |  |  |  |  |  |
Maximum [member] | Buildings [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 50 years |  |  |  |  |  |  |  |
Maximum [member] | Fixtures, fittings and equipment [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 25 years |  |  |  |  |  |  |  |
Maximum [member] | Software [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Minimum [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalisation rate used to calculate the eventual sales value |  |  |  |  | 6.00% |  |  |  |  |  |  |  |
Covenant Liquidity | 400 |  |  |  | $ 400 |  |  |  |  |  |  |  |
Minimum [member] | North America Hotels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge | $ 6 |  |  |  |  |  |  |  |  |  |  |  |
Growth rate used to extrapolate cash flow projections |  |  | 11.00% |  |  |  |  |  |  |  |  |  |
Capitalisation rate used to calculate the eventual sales value |  |  | 7.50% |  |  |  |  |  |  |  |  |  |
Minimum [member] | US corporate headquarters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | $ 1 |  |  |  |  |  |  |  |
Minimum [member] | Fixtures, fittings and equipment [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Minimum [member] | Software [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 3 years |  |  |  |  |  |  |  |

X
- Definition Adjustments for impairment loss (reversal of impairment loss) on loans and advances recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_20&doctype=Standard -URIDate 2020-01-01 + Details
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X
- Definition The amortisation method used for intangible assets other than goodwill with finite useful lives. [Refer: Intangible assets other than goodwill; Depreciation and amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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X
- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of commercial paper issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of liability representing income that has been received but is not yet earned. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78&doctype=Standard -URIDate 2020-01-01 + Details
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