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Pensions - Sensitivities of the present value of defined benefit obligation (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Pensions |  |
Weighted average duration of defined benefit obligation | 14 years | 15 years 3 months 18 days
Main Pension Scheme |  |
Pensions |  |
Active members | 7.50% | 8.40%
Deferred members | 41.90% | 41.00%
Pensioners and dependants | 50.60% | 50.60%
Total proportions to the different classes of scheme | 100.00% | 100.00%
Discount rate | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.50% | 0.50%
(Decrease)/ increase in value of assets | £ (2,292) | £ (2,689)
(Decrease)/ increase in value of liabilities | 1,746 | 1,766
Increase in net pension (obligations)/assets | £ 546 | £ 923
Inflation | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of assets | £ 811 | £ 963
(Decrease)/ increase in value of liabilities | (578) | (632)
Increase in net pension (obligations)/assets | £ (233) | £ (331)
Credit spreads | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.50% | 0.50%
Decrease in actuarial assumption (as a percent) | 0.50% | 0.50%
(Decrease)/ increase in value of assets | £ (12) | £ (6)
(Decrease)/ increase in value of liabilities | 1,746 | 1,766
Increase in net pension (obligations)/assets | £ (1,734) | £ (1,760)
Percentage of larger reasonably possible increase in actuarial assumption | 0.50% | 0.50%
Credit spreads | Actuarial assumption of longevity, decrease by 2 years | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | £ 3,500 | £ 3,700
Net pension assets/obligations, assuming no change in one of the actuarial assumption | 1,900 | 2,100
Increase in net pension (obligations)/assets |  | 300
Credit spreads | Actuarial assumption of longevity, decrease by 1 year | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | 2,600 | 2,800
Net pension assets/obligations, assuming no change in one of the actuarial assumption | 900 | 1,100
Increase in net pension (obligations)/assets | (1,000) | (900)
Credit spreads | Actuarial assumption of longevity, no change | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | 1,700 | 1,800
Increase in net pension (obligations)/assets | (2,000) | (2,000)
Credit spreads | Actuarial assumption of longevity, increase by 1 year | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | 900 | 800
Net pension assets/obligations, assuming no change in one of the actuarial assumption | (900) | (1,100)
Increase in net pension (obligations)/assets | (2,900) | (3,200)
Credit spreads | Actuarial assumption of longevity, increase by 2 years | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | 100 | (200)
Net pension assets/obligations, assuming no change in one of the actuarial assumption | (1,800) | (2,100)
Increase in net pension (obligations)/assets | £ (3,900) | £ (4,300)
Longevity increase | Main Pension Scheme |  |
Pensions |  |
Actuarial assumption of longevity increase | 1 year | 1 year
(Decrease)/ increase in value of liabilities | £ (902) | £ (767)
Increase in net pension (obligations)/assets | £ 902 | £ 767
Pension increase | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of liabilities | £ (706) | £ (679)
Increase in net pension (obligations)/assets | £ 706 | £ 679
Equity values | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 10.00% | 10.00%
(Decrease)/ increase in value of assets | £ 229 | £ 267
Increase in net pension (obligations)/assets | £ (229) | £ (267)

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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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + Details
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