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Staff costs and Directors' remuneration - Summary of Staff Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Costs borne by IHG      
Pension and other post-retirement benefits:      
Staff costs, classified as exceptional $ 8    
Costs borne by the System Fund or reimbursed      
Pension and other post-retirement benefits:      
Staff costs, classified as exceptional 7    
Costs by employer      
Staff costs      
Wages and salaries 1,888 $ 1,890 $ 1,752
Social security costs 167 159 143
Share-based payment cost (note 27) 72 67 56
Pension and other post-retirement benefits:      
Defined benefit plans 7 7 4
Defined contribution plans 66 62 58
Total staff costs 2,200 2,185 2,013
Costs by employer | Costs borne by IHG      
Pension and other post-retirement benefits:      
Total staff costs 792 800 747
Costs by employer | Costs borne by the System Fund or reimbursed      
Pension and other post-retirement benefits:      
Total staff costs $ 1,408 $ 1,385 $ 1,266