Retirement benefit obligations - Schedule of Defined Benefit Pension Expense (Details) - Defined contribution pension schemes - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Defined Benefit Pension Expense [Line Items]
Charge for the year	£ 88	£ 180	£ 213
Net interest amount	(208)	(95)	(29)
Settlements	0	0	1
Past service cost – plan amendments	5	4	11
Plan administration costs incurred during the year	35	34	38
Total defined benefit pension (credit) expense	£ (80)	£ 123	£ 234

The amount of administration costs in the current period related to defined benefit plans that are not reflected in the return on plan assets. [Refer: Administrative expenses; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from administration costs not reflected in return on plan assets; Return on plan assets excluding interest income or expense, net of tax, defined benefit plans; Return on plan assets excluding interest income or expense, before tax, defined benefit plans]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 135
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard
-URIDate 2023-03-23

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- Definition

The expense of employee service in the current period arising from defined benefit plans. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase in net defined benefit liability (asset) resulting from current service cost]

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- Definition

The amount of income (expense) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Post-employment benefit expense in profit or loss, defined benefit plans; Defined benefit plans [member]; Actuarial assumptions [member]] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements]

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- Definition

The amount of interest expense (income) arising from defined benefit plans. [Refer: Interest income (expense); Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

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- Definition

The amount of expense (income) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Post-employment benefit expense in profit or loss, defined benefit plans; Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from past service cost]

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- Definition

The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 5
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_5&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 135
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard
-URIDate 2023-03-23

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- References

No definition available.

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