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Leases - Summary of Maturity of Lease Liabilities (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure Of Leases [Line Items] |  |  |
Gross lease liabilities | £ 2,692 | £ 2,772 |
Effect of discounting | (672) | (618) |
Lease liability at end of year | 2,020 | 2,154 | £ 2,210
Short-term lease liability | 240 | 292 |
Long-term lease liability | 1,780 | 1,862 |
Within one year |  |  |
Disclosure Of Leases [Line Items] |  |  |
Gross lease liabilities | 353 | 406 |
Between one and two years |  |  |
Disclosure Of Leases [Line Items] |  |  |
Gross lease liabilities | 307 | 327 |
Between two and three years |  |  |
Disclosure Of Leases [Line Items] |  |  |
Gross lease liabilities | 281 | 282 |
Between three and four years |  |  |
Disclosure Of Leases [Line Items] |  |  |
Gross lease liabilities | 256 | 261 |
Between four and five years |  |  |
Disclosure Of Leases [Line Items] |  |  |
Gross lease liabilities | 235 | 231 |
Over five years |  |  |
Disclosure Of Leases [Line Items] |  |  |
Gross lease liabilities | £ 1,260 | £ 1,265 |

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 58 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_58&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph B11D -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
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