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Pensions - Amounts in the Financial statements (Details) - GBP (£) £ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pensions
Fund assets at fair value	£ 37,111	£ 37,598	£ 57,787	£ 57,249	£ 51,925
Present value of fund liabilities	(29,592)	(27,601)	(46,808)	(48,864)	(44,115)
Net surplus	7,519	9,997	10,979	£ 8,385	£ 7,810
Net assets of schemes in surplus	201	318
Net liabilities of schemes in deficit	(99)	(98)
Retirement benefit liability	(102)	(220)	(488)
Asset ceiling/minimum funding
Pensions
Retirement benefit liability	£ 7,417	£ 9,777	£ 10,491

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

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The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

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