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Share-based payments - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) award shares | Dec. 31, 2019 £ / shares | Dec. 31, 2018 USD ($) award shares | Dec. 31, 2018 £ / shares | Dec. 31, 2017 USD ($) award shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Share based payment cost | $ | $ 28 |  | $ 27 |  | $ 21
Weighted average share price at exercise date | £ / shares |  | £ 45.848 |  | £ 45.838 |
Share based payment cash-settled | $ | 2 |  | 0 |  | 0
System Fund [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Share based payment cost | $ | 12 |  | 11 |  | 6
Administrative expenses [member] | Exceptional items [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Share based payment cost | $ | $ 1 |  | $ 1 |  | $ 2
Maximum [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
IHG share price | £ / shares |  | 57.38 |  |  |
Minimum [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
IHG share price | £ / shares |  | 40.92 |  |  |
Closing [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
IHG share price | £ / shares |  | £ 52.08 |  |  |
Annual Performance Plan [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 217,000 |  | 176,000 |  | 235,000
Annual Performance Plan one-off awards | shares | 86,126 |  | 48,771 |  | 79,471
Long Term Incentive Plan [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 826,313 |  | 784,119 |  | 805,045
Vesting period of share awards | 3 years |  |  |  |
LTIP Restricted stock units [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 540,000 |  | 527,000 |  | 525,000
LTIP Performance-related awards [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 287,000 |  | 257,000 |  | 280,000

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