Contingent liabilities, commitments and guarantees - Narrative (Details) - GBP (£) £ in Millions	6 Months Ended
Jun. 30, 2024	Dec. 31, 2023
Contingent liabilities, commitments and guarantees [Line Items]
Estimated financial effect of contingent liabilities	£ 2,696	£ 2,849
Gross loan commitments	150,396	143,319
Maximum exposure
Contingent liabilities, commitments and guarantees [Line Items]
Irrevocable commitments and guarantees	81,041	£ 75,080
Legal proceedings contingent liability
Contingent liabilities, commitments and guarantees [Line Items]
Increase in current tax liabilities	950
Reduction in deferred tax asset	£ 275

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

- Definition

The amount of contractual undiscounted cash flows for gross commitments to receive a loan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
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-IssueDate 2023-01-01
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_B11D_e&doctype=Appendix&subtype=B
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- Definition

The increase (decrease) in a deferred tax liability (asset). [Refer: Deferred tax liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 12
-IssueDate 2023-01-01
-Paragraph 81
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81&doctype=Standard
-URIDate 2023-03-23

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- References

No definition available.

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- Definition

Increase (Decrease) In Current Tax Liability

+ References

No definition available.

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- References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
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- Details

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