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Property, plant and equipment - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) Hotel | Dec. 31, 2019 Hotel
Disclosure of detailed information about property, plant and equipment [line items] |  |
Number of open hotels | Hotel | 23 | 26
Impairment loss recognised in profit or loss, property, plant and equipment | $ 90 |
Property Plant And Equipment System Fund Impairment Charge | 5 |
US corporate headquarters [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss recognised in profit or loss, property, plant and equipment | 7 |
US corporate headquarters [Member] | System Fund [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss recognised in profit or loss, property, plant and equipment | 5 |
Development Land Sites [Member] | Americas [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss recognised in profit or loss, property, plant and equipment | 3 |
UK Portfolio [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss recognised in profit or loss, property, plant and equipment | 50 |
Three Hotels In North America [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss recognised in profit or loss, property, plant and equipment | $ 35 |

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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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