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Pensions - Funding and contributions by the Group and most significant assumptions used for the Main Scheme (Details) € in Millions, £ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 EUR (€) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 GBP (£)
Pensions |  |  |  |  |
Administrative expenses |  | £ 3,971 |  | £ 4,082 | £ 3,980
Contributions by employer |  | £ 775 |  | £ 780 |
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 | 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 | 29 years 4 months 24 days |  |
Life expectancy of male employees after retirement who are currently aged 40 |  | 28 years 10 months 24 days | 28 years 10 months 24 days |  |
Life expectancy of female employees after retirement who are currently aged 40 |  | 30 years 8 months 12 days | 30 years 8 months 12 days |  |
Main Scheme |  |  |  |  |
Pensions |  |  |  |  |
Period of funding valuations (in years) |  | 3 years | 3 years |  |
Funding level, as percent |  |  |  | 104.00% |
Future contribution to funding if distribution to shareholders are made, capped amount |  | £ 1,500 |  |  |
Contributions Resulting From Ring Fencing Arrangements | € 500 | 500 |  | £ 500 |
Pension liabilities |  |  |  | 49,000 |
Deficit |  |  |  | 2,000 |
Contributions by employer |  | £ 708 | € 708 | £ 705 |
Average cost (as a percent) |  |  |  | 49.00% |
Main Scheme | Principal IAS 19 actuarial assumptions |  |  |  |  |
Pensions |  |  |  |  |
Discount rate |  | 5.00% |  | 1.80% |
Inflation assumption (RPI) |  | 3.20% |  | 3.30% |
Rate of increase in salaries |  | 1.80% |  | 1.80% |
Rate of increase in deferred pensions |  | 3.20% |  | 3.70% |
Rate of increase in pensions in payment |  | 2.50% |  | 2.50% |
Proportion of pension converted to a cash lump sum at retirement |  | 18.00% |  | 18.00% |
Longevity at age 60 for current pensioners (years), males |  | 27 years 3 months 18 days | 27 years 3 months 18 days | 27 years 3 months 18 days |
Longevity at age 60 for current pensioners (years), females |  | 29 years 1 month 6 days | 29 years 1 month 6 days | 29 years |
Longevity at age 60 for future pensioners currently aged 40 (years), males |  | 28 years 3 months 18 days | 28 years 3 months 18 days | 28 years 2 months 12 days |
Longevity at age 60 for future pensioners currently aged 40 (years), females |  | 30 years 1 month 6 days | 30 years 1 month 6 days | 30 years 1 month 6 days |
Main 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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