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Share-based payments - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
£ / shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
£ / shares
Dec. 31, 2019
USD ($)
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Vesting period of share awards   3 years    
Weighted average share price at exercise date £ 50.812   £ 48.745  
Liabilities from share-based payment transactions | $ £ 0 $ 0 £ 0 $ 0
Maximum [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
IHG share price £ 53.36      
Minimum [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
IHG share price 43.99      
Closing [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
IHG share price £ 47.81      
Colleague Share Plan [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Number of shares purchased by employees | shares   31,234 36,298  
Maximum Limit of share value to employees | $   $ 1,000