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Deferred tax - Additional Information (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross tax losses and other temporary differences available for offset against future profits | £ 10,040 | £ 10,321
Gross tax losses and other temporary differences, deferred tax assets that have been recognised | 2,313 | 2,399
Unrecognised temporary differences | 7,727 | 7,922
Losses carried forward | 7,568 | 7,713
Temporary differences, deferred tax liabilities that have not been recognised | 1,286 | 1,355
Expires Within One To Ten Years |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Losses carried forward | £ 77 | £ 92
Bottom of Range |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognised temporary differences, period | 1 year |
Top of Range |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognised temporary differences, period | 10 years |

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce deferred tax expense. [Refer: Deferred tax expense (income); Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 80 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_80_f&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Deductible Temporary Differences For Which No Deferred Tax Liability Is Recognised + References No definition available. + Details
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- Definition Gross Tax Losses And Other Temporary Differences Available For Offset Against Future Profits + References No definition available. + Details
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