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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
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pensions |  |  |
Administrative expenses | £ 4,082 | £ 3,980 | £ 5,304
Contributions by employer | £ 780 | 296 |
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 |  |
Amount of impact of guaranteed minimum pension equalisation | £ 0 | £ 169 |
Main Scheme |  |  |
Pensions |  |  |
Period of funding valuations (in years) | 3 years |  |
Funding level, as percent |  | 104.00% |
Pension liabilities |  | £ 49,000 |
Deficit |  | 2,000 |
Cash payment | £ 1,500 |  |
Contributions by employer | 705 | 233 |
Contributions by employer, capped amount | £ 500 | £ 0 |
Average cost (as a percent) |  | 49.00% |
Main Scheme | Principal IAS 19 actuarial assumptions |  |  |
Pensions |  |  |
Discount rate | 1.80% | 1.40% |
Inflation assumption (RPI) | 3.30% | 2.90% |
Rate of increase in salaries | 1.80% | 1.80% |
Rate of increase in deferred pensions | 3.70% | 3.00% |
Rate of increase in pensions in payment | 2.50% | 2.70% |
Proportion of pension converted to a cash lump sum at retirement | 18.00% | 20.00% |
Longevity at age 60 for current pensioners (years), males | 27 years 3 months 18 days | 27 years 1 month 6 days |
Longevity at age 60 for current pensioners (years), females | 29 years | 29 years |
Longevity at age 60 for future pensioners currently aged 40 (years), males | 28 years 2 months 12 days | 28 years 3 months 18 days |
Longevity at age 60 for future pensioners currently aged 40 (years), females | 30 years 1 month 6 days | 30 years 4 months 24 days |
Main Scheme | Maximum | Distributions to shareholders of an equal amount are made [Member] |  |  |
Pensions |  |  |
Settlement of the future contributions | £ 500 |  |

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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 [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of expenses that the entity classifies as being administrative. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2021-01-01 -Paragraph 35 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2021-en-r&anchor=para_35_b_vi&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_103&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_99&doctype=Standard -URIDate 2021-03-24 + Details
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