v3.25.4

Retirement benefit obligations - Schedule of Net Retirement Benefits Amounts Recognized in Balance Sheet (Details) - GBP (£) £ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Amounts Recognized in Balance Sheet [Line Items]
Defined benefit asset	£ 2,575	£ 2,906
Defined benefit pension schemes
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Amounts Recognized in Balance Sheet [Line Items]
Defined benefit asset	2,612	2,945	£ 3,532
Present value of funded obligations
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Amounts Recognized in Balance Sheet [Line Items]
Defined benefit asset	(26,571)	(27,118)	(30,201)
Fair value of scheme assets
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Amounts Recognized in Balance Sheet [Line Items]
Defined benefit asset	£ 29,183	£ 30,063	£ 33,733

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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 [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 140
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_140_a&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 206
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-IssueDate 2025-01-01
-Paragraph 206
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard
-URIDate 2025-03-27

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- References

No definition available.

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