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Staff Costs and Directors' Emoluments - Summary of Average Number of Employees (Detail) - Costs by employer [member] - Employee | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 36,643 | 35,330 | 34,790
Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 9,636 | 7,598 | 6,658
Costs are borne by the System Fund [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 4,800 | 5,214 | 5,555
Costs are reimbursed [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 22,207 | 22,518 | 22,577
Americas [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 2,170 | 2,225 | 2,149
EMEAA [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 5,227 | 3,255 | 2,267
Greater China [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 339 | 324 | 294
Central [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 1,900 | 1,794 | 1,948

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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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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