Retirement benefit obligations - Schedule of Defined Benefit Scheme Obligations (Details) - GBP (£) £ in Millions	Jun. 30, 2022	Dec. 31, 2021
Recognised on the balance sheet as:
Retirement benefit assets	£ 5,473	£ 4,531
Retirement benefit obligations	(187)	(230)
Net amounts presented in the balance sheet
Defined benefit pension schemes:
Fair value of scheme assets	39,365	51,534
Present value of funded obligations	(33,992)	(47,130)
Amount recognized
Defined benefit pension schemes:
Total amounts recognised in the balance sheet	5,286	4,301
Recognised on the balance sheet as:
Retirement benefit assets	5,473	4,531
Retirement benefit obligations	(187)	(230)
Amount recognized \| Net pension scheme asset
Defined benefit pension schemes:
Total amounts recognised in the balance sheet	5,373	4,404
Amount recognized \| Other post-retirement schemes
Defined benefit pension schemes:
Total amounts recognised in the balance sheet	£ (87)	£ (103)

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]

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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]]

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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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