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Share-based payments - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
award
shares
Dec. 31, 2020
£ / shares
Dec. 31, 2019
USD ($)
award
shares
Dec. 31, 2019
£ / shares
Dec. 31, 2018
USD ($)
award
shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Vesting period of share awards 3 years        
Share based payment cost | $ $ 19,000   $ 28,000   $ 27,000
Weighted average share price at exercise date | £ / shares   £ 48.745   £ 45.848  
Share based payment cash-settled | $ 2,000   2,000   0
System Fund [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Share based payment cost | $ $ 11,000   12,000   11,000
Administrative expenses [member] | Exceptional items [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Share based payment cost | $     $ 2,018,000   $ 1,000
Maximum [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
IHG share price | £ / shares   52.23      
Minimum [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
IHG share price | £ / shares   23.855      
Closing [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
IHG share price | £ / shares   £ 46.90      
Annual Performance Plan [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Number of shares awarded to employees | award 138,268   217,000   175,944
Annual Performance Plan one-off awards | shares 27,245   86,126   48,771
Long Term Incentive Plan [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Number of shares awarded to employees | award 1,078,752   826,313   784,119
LTIP Restricted stock units [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Number of shares awarded to employees | award 696,094   539,567   526,879
LTIP Performance-related awards [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Number of shares awarded to employees | award 383,000   286,746   257,000
Colleague Share Plan [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Number of shares awarded to employees | award 36,298   0   0
Maximum Limit of share value to employees | $ $ 1,000