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Derivatives - Derivatives in hedge accounting relationships (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IFRS netting |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Hedging instrument, assets | £ (2,520) | £ (3,063) |
Hedging instrument, liabilities | (5,259) | (7,568) |
Derivatives after IFRS netting |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Hedging instrument, assets | 118 | 114 |
Hedging instrument, liabilities | 464 | 270 |
Derivatives | Derivatives before IFRS netting |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Notional amount | 265,700 | 224,800 |
Hedging instrument, assets | 2,638 | 3,177 |
Hedging instrument, liabilities | 5,723 | 7,838 |
Changes in fair value used for hedge ineffectiveness | 1,549 | 1,602 |
Fair value hedging |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Changes in fair value used for hedge ineffectiveness | 958 | 406 | £ 482
Fair value hedging | Interest rate derivatives |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Notional amount | 83,100 | 67,600 |
Hedging instrument, assets | 1,096 | 1,139 |
Hedging instrument, liabilities | 1,965 | 2,607 |
Changes in fair value used for hedge ineffectiveness | 958 | 406 |
Cash flow hedging | Interest rate derivatives |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Notional amount | 167,900 | 140,000 |
Hedging instrument, assets | 1,424 | 1,924 |
Hedging instrument, liabilities | 3,300 | 4,970 |
Changes in fair value used for hedge ineffectiveness | 581 | 1,211 |
Cash flow hedging | Exchange rate derivatives |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Notional amount | 14,400 | 16,900 |
Hedging instrument, assets | 116 | 112 |
Hedging instrument, liabilities | 457 | 254 |
Changes in fair value used for hedge ineffectiveness | 1 | (12) |
Net investment hedging | Exchange rate derivatives |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Notional amount | 300 | 300 |
Hedging instrument, assets | 2 | 2 |
Hedging instrument, liabilities | 1 | 7 |
Changes in fair value used for hedge ineffectiveness | 9 | (3) |
Net investment hedging | Debt securities in issue |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Notional amount | 3,144 | 3,054 |
Hedging instrument, liabilities | £ 3,163 | £ 3,061 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising 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 2024-01-01 -Paragraph 24A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
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