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Staff Costs and Directors' Emoluments - Summary of Average Number of Employees (Detail) - Costs by employer [member] | 12 Months Ended
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Dec. 31, 2018 Employee | Dec. 31, 2017 Employee | Dec. 31, 2016 Employee
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 35,330 | 34,790 | 34,023
Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 7,598 | 6,658 | 6,587
Costs are borne by the System Fund [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 5,214 | 5,555 | 5,434
Costs are reimbursed [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 22,518 | 22,577 | 22,002
Americas [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 2,225 | 2,149 | 2,121
EMEAA [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 3,255 | 2,267 | 2,380
Greater China [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 324 | 294 | 299
Central [member] | Costs borne by IHG [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 1,794 | 1,948 | 1,787

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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 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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