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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
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | $ 1,776 | $ 1,444 | $ 1,358
Costs borne by IHG [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | 646 | $ 569 | 500
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] | Reorganisation programmes [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | $ 1 |  | $ 27

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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_102&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_99&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 104 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_104&doctype=Standard -URIDate 2022-03-24 + Details
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