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Pensions - Funding and contributions by the Group and most significant assumptions used for the Main Scheme (Details) - GBP (£) £ in Millions | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2018
Pensions |  |  |  |
Fixed interest swap and guilt yields plus percentage | 0.64% |  |  |
Life expectancy of male employees after retirement who are currently at age 60 | 27 years 8 months 12 days |  |  |
Life expectancy of female employees after retirement who are currently at age 60 | 29 years 4 months 24 days |  |  |
Life expectancy of male employees after retirement who are currently aged 40 | 28 years 10 months 24 days |  |  |
Life expectancy of female employees after retirement who are currently aged 40 | 30 years 8 months 12 days |  |  |
Main Pension Scheme |  |  |  |
Pensions |  |  |  |
Period of funding valuations (in years) | 3 years |  |  |
Funding level, as percent |  | 104.00% |  |
Pension liabilities |  | £ 49,000 | £ 49,000 |
Surplus as per actuarial assumptions |  | £ 2,000 | 2,000 |
Average cost (as a percent) |  | 49.00% |  |
Future contribution to funding if distribution to shareholders are made, capped amount |  |  |  | £ 1,500
Contributions Resulting From Ring Fencing Arrangements |  |  | £ 1,000 |
Discount rate | 4.80% | 5.00% | 5.00% |
Inflation assumption (RPI) | 3.10% | 3.20% | 3.20% |
Rate of increase in salaries | 1.80% | 1.80% | 1.80% |
Rate of increase in deferred pensions | 3.20% | 3.20% | 3.20% |
Rate of increase in pensions in payment | 2.40% | 2.50% | 2.50% |
Proportion of pension converted to a cash lump sum at retirement | 18.00% | 18.00% | 18.00% |
Longevity at age 60 for current pensioners (years), males | 26 years 9 months 18 days | 27 years 3 months 18 days |  |
Longevity at age 60 for current pensioners (years), females | 28 years 7 months 6 days | 29 years 1 month 6 days |  |
Longevity at age 60 for future pensioners currently aged 40 (years), males | 27 years 8 months 12 days | 28 years 3 months 18 days |  |
Longevity at age 60 for future pensioners currently aged 40 (years), females | 29 years 6 months | 30 years 1 month 6 days |  |
Main Pension Scheme | Maximum | Distributions to shareholders of an equal amount are made [Member] |  |  |  |
Pensions |  |  |  |
Future contribution to funding if distribution to shareholders are made | £ 500 |  |  |

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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 [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + 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 [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + Details
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