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Pensions - Sensitivities of the present value of defined benefit obligation (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Pensions |  |
Weighted average duration of defined benefit obligation | 20 years | 22 years
Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.50% | 0.50%
Decrease in actuarial assumption (as a percent) | 0.50% | 0.50%
Active members | 10.70% | 14.20%
Deferred members | 47.60% | 50.90%
Pensioners and dependants | 41.70% | 34.90%
Total proportions to the different classes of scheme | 100.00% | 100.00%
Discount rate | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of assets | £ (2,917) | £ (2,585)
(Decrease)/ increase in value of liabilities | 1,926 | 2,384
Increase in net pension assets/ (obligations) | £ 991 | £ 201
Inflation | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of assets | £ 1,883 | £ 2,204
(Decrease)/ increase in value of liabilities | (1,329) | (1,603)
Increase in net pension assets/ (obligations) | £ (554) | £ (601)
Credit spreads | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of assets | £ (3) | £ (6)
(Decrease)/ increase in value of liabilities | 1,926 | 2,384
Increase in net pension assets/ (obligations) | (1,923) | (2,378)
Credit spreads | Actuarial assumption of longevity, decrease by 2 years | Main Scheme |  |
Pensions |  |
Increase in net pension assets/ (obligations) | 6,900 | 7,800
Net pension assets/obligations, assuming no change in one of the actuarial assumption | 3,600 | 3,900
Increase(decrease) in net pension assets/obligations, assuming decrease in one of the actuarial assumption | (300) | (600)
Credit spreads | Actuarial assumption of longevity, decrease by 1 year | Main Scheme |  |
Pensions |  |
Increase in net pension assets/ (obligations) | 5,300 | 6,100
Net pension assets/obligations, assuming no change in one of the actuarial assumption | 1,800 | 1,900
Increase(decrease) in net pension assets/obligations, assuming decrease in one of the actuarial assumption | (2,400) | (2,800)
Credit spreads | Actuarial assumption of longevity, no change | Main Scheme |  |
Pensions |  |
Increase in net pension assets/ (obligations) | 3,800 | 4,500
Increase(decrease) in net pension assets/obligations, assuming decrease in one of the actuarial assumption | £ (4,500) | (5,100)
Credit spreads | Actuarial assumption of longevity, increase by 1 year | Main Scheme |  |
Pensions |  |
Actuarial assumption of longevity increase | 1 year |
Increase in net pension assets/ (obligations) | £ 2,300 | 2,900
Net pension assets/obligations, assuming no change in one of the actuarial assumption | (1,800) | (1,900)
Increase(decrease) in net pension assets/obligations, assuming decrease in one of the actuarial assumption | £ (6,600) | (7,400)
Credit spreads | Actuarial assumption of longevity, increase by 2 years | Main Scheme |  |
Pensions |  |
Actuarial assumption of longevity increase | 2 years |
Increase in net pension assets/ (obligations) | £ 800 | 1,300
Net pension assets/obligations, assuming no change in one of the actuarial assumption | (3,600) | (3,900)
Increase(decrease) in net pension assets/obligations, assuming decrease in one of the actuarial assumption | £ (8,700) | £ (9,700)
Longevity increase | Main Scheme |  |
Pensions |  |
Actuarial assumption of longevity increase | 1 year | 1 year
(Decrease)/ increase in value of liabilities | £ (1,790) | £ (1,930)
Increase in net pension assets/ (obligations) | £ 1,790 | £ 1,930
Pension increase | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of liabilities | £ (1,485) | £ (1,608)
Increase in net pension assets/ (obligations) | £ 1,485 | £ 1,608
Equity values | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 10.00% | 10.00%
(Decrease)/ increase in value of assets | £ 442 | £ 454
Increase in net pension assets/ (obligations) | £ (442) | £ (454)

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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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_147_c&doctype=Standard -URIDate 2021-03-24 + Details
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