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Staff costs and Directors' remuneration - Summary of Average Number of Employees (Details) - employee
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of average number of employees [line items]      
Average number of employees, including part-time employees 27,849 28,139 27,598
Costs borne by IHG      
Disclosure of average number of employees [line items]      
Average number of employees, including part-time employees 7,459 7,387 7,292
Costs borne by IHG | Americas      
Disclosure of average number of employees [line items]      
Average number of employees, including part-time employees 1,665 1,612 1,578
Costs borne by IHG | EMEAA      
Disclosure of average number of employees [line items]      
Average number of employees, including part-time employees 3,629 3,635 3,642
Costs borne by IHG | Greater China      
Disclosure of average number of employees [line items]      
Average number of employees, including part-time employees 368 357 352
Costs borne by IHG | Central      
Disclosure of average number of employees [line items]      
Average number of employees, including part-time employees 1,797 1,783 1,720
Employees whose costs are borne by the System Fund or are reimbursed      
Disclosure of average number of employees [line items]      
Average number of employees, including part-time employees 20,390 20,752 20,306