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Pensions - Funding and contributions by the Group and most significant assumptions used for the Main Scheme (Details) - GBP (£) £ in Billions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Pensions |  |
Fixed interest swap and guilt yields plus percentage | 0.0064% |
Life expectancy of male employees after retirement who are currently at age 60 | 27 years 1 month 6 days |
Life expectancy of female employees after retirement who are currently at age 60 | 29 years 1 month 6 days |
Life expectancy of male employees after retirement who are currently aged 40 | 28 years 6 months |
Life expectancy of female employees after retirement who are currently aged 40 | 30 years 7 months 6 days |
Main Pension Scheme |  |
Pensions |  |
Period of funding valuations (in years) | 3 years |
Discount rate | 5.60% | 4.80%
Inflation assumption (RPI) | 3.20% | 3.10%
Rate of increase in salaries | 1.80% | 1.80%
Rate of increase in deferred pensions | 3.40% | 3.20%
Rate of increase in pensions in payment | 2.60% | 2.40%
Proportion of pension converted to a cash lump sum at retirement | 18.00% | 18.00%
Longevity at age 60 for current pensioners (years), males | 26 years 6 months | 26 years 9 months 18 days
Longevity at age 60 for current pensioners (years), females | 28 years 6 months | 28 years 7 months 6 days
Longevity at age 60 for future pensioners currently aged 40 (years), males | 27 years 6 months | 27 years 8 months 12 days
Longevity at age 60 for future pensioners currently aged 40 (years), females | 29 years 8 months 12 days | 29 years 6 months
Main pension scheme, 2023 triennial valuation |  |
Pensions |  |
Funding level, as percent | 115.00% |
Pension liabilities | £ 29 |
Surplus as per actuarial assumptions | £ 4 |
Average cost (as a percent) | 21.20% |

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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