Retirement benefit obligations - Schedule of Defined Benefit Scheme Obligations (Details) - GBP (£) £ in Millions	Jun. 30, 2025	Dec. 31, 2024
Schedule of Retirement Benefits Recognised in Balance Sheet [Line Items]
Total amounts recognised in the balance sheet	£ 2,834	£ 2,906
Retirement benefit assets	2,953	3,028
Retirement benefit obligations	(119)	(122)
Defined benefit pension schemes:
Schedule of Retirement Benefits Recognised in Balance Sheet [Line Items]
Total amounts recognised in the balance sheet	2,873	2,945
Other post-retirement schemes
Schedule of Retirement Benefits Recognised in Balance Sheet [Line Items]
Total amounts recognised in the balance sheet	(39)	(39)
Present value of funded obligations
Schedule of Retirement Benefits Recognised in Balance Sheet [Line Items]
Total amounts recognised in the balance sheet	(26,310)	(27,118)
Fair value of scheme assets
Schedule of Retirement Benefits Recognised in Balance Sheet [Line Items]
Total amounts recognised in the balance sheet	£ 29,183	£ 30,063

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 [domain]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]]

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