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Pensions - Sensitivities of the present value of defined benefit obligation (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Pensions |  |
Weighted average duration of defined benefit obligation | 15 years 3 months 19 days |
Main Scheme |  |
Pensions |  |
Active members | 8.40% | 10.70%
Deferred members | 41.00% | 47.60%
Pensioners and dependants | 50.60% | 41.70%
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 | £ (1,389) | £ (2,917)
(Decrease)/ increase in value of liabilities | 907 | 1,926
Increase in net pension (obligations)/assets | £ 482 | £ 991
Inflation | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of assets | £ 963 | £ 1,883
(Decrease)/ increase in value of liabilities | (632) | (1,329)
Increase in net pension (obligations)/assets | £ (331) | £ (554)
Credit spreads | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of assets | £ (3) | £ (3)
(Decrease)/ increase in value of liabilities | 907 | 1,926
Increase in net pension (obligations)/assets | (904) | (1,923)
Credit spreads | Actuarial assumption of longevity, decrease by 2 years | Main Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | (3,200) | (6,900)
Net pension assets/obligations, assuming no change in one of the actuarial assumption | (1,600) | (3,600)
Increase in net pension (obligations)/assets | 300 | 300
Credit spreads | Actuarial assumption of longevity, decrease by 1 year | Main Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | (2,500) | (5,300)
Net pension assets/obligations, assuming no change in one of the actuarial assumption | (800) | (1,800)
Increase in net pension (obligations)/assets | 1,200 | 2,400
Credit spreads | Actuarial assumption of longevity, no change | Main Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | (1,800) | (3,800)
Increase in net pension (obligations)/assets | £ 2,000 | 4,500
Credit spreads | Actuarial assumption of longevity, increase by 1 year | Main Scheme |  |
Pensions |  |
Actuarial assumption of longevity increase | 1 year |
Increase in net pension (obligations)/assets | £ (1,100) | (2,300)
Net pension assets/obligations, assuming no change in one of the actuarial assumption | 800 | 1,800
Increase in net pension (obligations)/assets | £ 2,800 | 6,600
Credit spreads | Actuarial assumption of longevity, increase by 2 years | Main Scheme |  |
Pensions |  |
Actuarial assumption of longevity increase | 2 years |
Increase in net pension (obligations)/assets | £ (400) | (800)
Net pension assets/obligations, assuming no change in one of the actuarial assumption | 1,500 | 3,600
Increase in net pension (obligations)/assets | £ 3,600 | £ 8,700
Longevity increase | Main Scheme |  |
Pensions |  |
Actuarial assumption of longevity increase | 1 year | 1 year
(Decrease)/ increase in value of liabilities | £ (767) | £ (1,790)
Increase in net pension (obligations)/assets | £ 767 | £ 1,790
Pension increase | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of liabilities | £ (679) | £ (1,485)
Increase in net pension (obligations)/assets | £ 679 | £ 1,485
Equity values | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 10.00% | 10.00%
(Decrease)/ increase in value of assets | £ 267 | £ 442
Increase in net pension (obligations)/assets | £ (267) | £ (442)
0.5% increase in interest rates/discount rate | Main Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.50% |
(Decrease)/ increase in value of assets | £ (2,689) |
(Decrease)/ increase in value of liabilities | £ 1,766 |

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