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Staff costs and Directors' remuneration - Summary of Average Number of Employees (Detail) - Costs by employer [member] - Employee | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 22,328 | 28,812 | 36,643
Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 6,013 | 8,146 | 9,636
Costs are borne by the System Fund [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 4,508 | 4,686 | 4,800
Costs are reimbursed [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 11,807 | 15,980 | 22,207
Americas [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 1,481 | 1,931 | 2,170
EMEAA [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 2,808 | 4,088 | 5,227
Greater China [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 299 | 314 | 339
Central [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 1,425 | 1,813 | 1,900

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- Definition The average number of personnel employed by the entity during a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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