v3.25.4

Derivative financial instruments - Schedule of Hedged Items and Gains and Losses Arising from Hedge Accounting (Details) - Fair value hedges - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Line Items] |  |  |
Carrying amount of the hedged item, assets | £ 156,790 | £ 153,277 |
Carrying amount of the hedged item, liabilities | 45,053 | 51,499 |
Accumulated amount of fair value adjustment on the hedged item, assets | (1,231) | (1,960) |
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities | 829 | 1,340 |
Change in fair value of hedged item for ineffectiveness assessment £m | 57 | (1,417) |
Hedge ineffectiveness recognised in the income statement £m | (54) | (81) | £ (267)
Interest rate |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Line Items] |  |  |
Hedge ineffectiveness recognised in the income statement £m | (54) | (81) |
Fixed rate mortgages |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Line Items] |  |  |
Carrying amount of the hedged item, assets | 121,732 | 124,013 |
Carrying amount of the hedged item, liabilities | 0 | 0 |
Accumulated amount of fair value adjustment on the hedged item, assets | (178) | (890) |
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities | 0 | 0 |
Change in fair value of hedged item for ineffectiveness assessment £m | 725 | (184) |
Fixed rate mortgages | Interest rate |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Line Items] |  |  |
Hedge ineffectiveness recognised in the income statement £m | (68) | (52) |
Fixed rate issuance |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Line Items] |  |  |
Carrying amount of the hedged item, assets | 0 | 0 |
Carrying amount of the hedged item, liabilities | 45,053 | 51,499 |
Accumulated amount of fair value adjustment on the hedged item, assets | 0 | 0 |
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities | 829 | 1,340 |
Change in fair value of hedged item for ineffectiveness assessment £m | (530) | (75) |
Fixed rate issuance | Interest rate |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Line Items] |  |  |
Hedge ineffectiveness recognised in the income statement £m | 10 | (11) |
Fixed rate bonds |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Line Items] |  |  |
Carrying amount of the hedged item, assets | 35,058 | 29,264 |
Carrying amount of the hedged item, liabilities | 0 | 0 |
Accumulated amount of fair value adjustment on the hedged item, assets | (1,053) | (1,070) |
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities | 0 | 0 |
Change in fair value of hedged item for ineffectiveness assessment £m | (138) | (1,158) |
Fixed rate bonds | Interest rate |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Line Items] |  |  |
Hedge ineffectiveness recognised in the income statement £m | £ 4 | £ (18) |

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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as an asset. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_ii&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 61 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_ii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as a liability. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_ii&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 61 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_ii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The gain (loss) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24C_a_i&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 62 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_62_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 62 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_62_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of a hedged item, recognised as an asset. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_i&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 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_i&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of a hedged item, recognised as a liability. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_i&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 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_i&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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