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Staff costs and Directors' remuneration - Summary of Staff Costs (Detail) - Costs by employer [member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Costs |  |  |
Wages and salaries | $ 1,808 | $ 1,604 | $ 1,315
Social security costs | 143 | 117 | 86
Pension and other post-retirement benefits: |  |  |
Defined benefit plans (note 27) | 4 | 2 | 2
Defined contribution plans | 58 | 53 | 41
Total staff costs | 2,013 | 1,776 | 1,444
Expenses borne by IHG [member] |  |  |
Pension and other post-retirement benefits: |  |  |
Total staff costs | 747 | 646 | 569
Expenses borne by system fund or reimbursed [member] |  |  |
Pension and other post-retirement benefits: |  |  |
Total staff costs | $ 1,266 | $ 1,130 | $ 875

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- Definition The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_5&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 + Details
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