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Employee benefit obligations - Sensitivity Analysis of Significant Actuarial Assumptions (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Assumption, increase in longevity | 1 year | 1 year
Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Assumption, basis point increase | 0.25% | 0.25%
Assumption, basis point decrease | 0.25% | 0.25%
Discount rate | United Kingdom |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | £ 0 | £ 0
Increase/(decrease) in benefit obligation, due to decrease in assumption | 0 | 0
Discount rate | North America |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | (3) | (4)
Increase/(decrease) in benefit obligation, due to decrease in assumption | 3 | 4
Discount rate | Western Continental Europe |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | (2) | (2)
Increase/(decrease) in benefit obligation, due to decrease in assumption | 2 | 2
Discount rate | Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | (1) | (1)
Increase/(decrease) in benefit obligation, due to decrease in assumption | £ 1 | £ 1
Rate of increase in salaries |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Assumption, basis point increase | 0.25% | 0.25%
Assumption, basis point decrease | 0.25% | 0.25%
Rate of increase in salaries | Western Continental Europe |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | £ 1 | £ 1
Increase/(decrease) in benefit obligation, due to decrease in assumption | (1) | (1)
Rate of increase in salaries | Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | 1 | 0
Increase/(decrease) in benefit obligation, due to decrease in assumption | £ (1) | £ (1)
Rate of increase in pensions in payment |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Assumption, basis point increase | 0.25% | 0.25%
Assumption, basis point decrease | 0.25% | 0.25%
Rate of increase in pensions in payment | United Kingdom |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | £ 0 | £ 0
Increase/(decrease) in benefit obligation, due to decrease in assumption | 0 | 0
Rate of increase in pensions in payment | Western Continental Europe |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | 1 | 1
Increase/(decrease) in benefit obligation, due to decrease in assumption | (1) | (1)
Life expectancy | United Kingdom |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | 1 | 1
Life expectancy | North America |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | 3 | 3
Life expectancy | Western Continental Europe |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase/(decrease) in benefit obligation, due to increase in assumption | £ 3 | £ 3

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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