v3.25.4

Fair values of financial assets and liabilities - Narrative (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | [1]
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Level 3 financial assets carried at fair value | £ 296,460 | £ 270,680 |  |
Level 3 financial liabilities carried at fair value | 105,681 | 100,515 |  |
Total financial liabilities (excluding derivatives) at fair value | 27,909 | 27,611 |  |
Amount contractually payable on debt securities held at fair value through profit or loss | 8,934 | 9,863 |  |
Difference between the balance sheet carrying value and amount contractually payable on debt securities held at fair value through profit or loss | 4,691 | 5,233 |  |
Increase in fair value measurement, liabilities | 114 |  |  |
Other comprehensive income, before tax, change in fair value of financial liability attributable to change in credit risk of liability | (126) | (78) | [1] | £ (234)
Debt instruments issued at fair value through profit or loss, designated upon initial recognition or subsequently | 4,243 | 4,630 |  |
Derivative assets £m | 19,727 | 24,065 |  |
Derivative liabilities £m | £ 16,132 | £ 21,676 |  |
Expected volatility in recovery rate of distressed derivatives (in percent) | 0.08 |  |  |
Bottom of range |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Weighted average expected volatility (in percent) | 12.00% | 11.00% |  |
Bottom of range | Residential Mortgage Backed Securities1 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Debt instrument term | 2 years |  |  |
Top of range |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Weighted average expected volatility (in percent) | 195.00% | 183.00% |  |
Top of range | Residential Mortgage Backed Securities1 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Debt instrument term | 5 years |  |  |
Total financial assets (excluding derivatives) at fair value |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets (excluding derivatives) at fair value | £ 276,733 | £ 246,615 |  |
[1] | 1 Current tax and deferred tax impacts, previously shown in aggregate for each reserve, are now presented alongside each line item. Comparatives are represented on a consistent basis.

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- Definition The amount of instruments issued by the entity that represent indebtedness at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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