Retirement benefit obligations - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet (Details) - GBP (£) £ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet [Line Items]
Retirement benefit assets	£ 3,028	£ 3,624
Retirement benefit obligations	(122)	(136)
Defined benefit asset	2,906	3,488
Defined benefit pension schemes
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet [Line Items]
Retirement benefit assets	3,028	3,624
Retirement benefit obligations	(83)	(92)
Defined benefit asset	2,945	3,532	£ 3,732
Other retirement benefit schemes
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet [Line Items]
Defined benefit asset	£ (39)	£ (44)

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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