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Staff costs and Directors' remuneration - Summary of Staff Costs (Parenthetical) (Detail) - Costs by employer [member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | $ 1,444 | $ 1,358 | $ 2,180
Costs borne by IHG [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | $ 569 | 500 | 735
System Fund [member] | 2020 reorganisation programme [Member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items |  | 20 |
Exceptional items [member] | Costs borne by IHG [member] | Comprehensive efficiency programme [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items |  |  | 9
Exceptional items [member] | Costs borne by IHG [member] | Reorganisation programmes [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items |  | $ 27 |
Exceptional items [member] | System Fund [member] | Comprehensive efficiency programme [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items |  |  | $ 8

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