Contingent liabilities, commitments and guarantees - Narrative (Details) £ in Millions	6 Months Ended
Jun. 30, 2025 GBP (£) classAction	Dec. 31, 2024 GBP (£)
Contingent liabilities, commitments and guarantees [Line Items]
Estimated financial effect of contingent liabilities	£ 2,705	£ 2,605
Gross loan commitments	£ 154,136	148,619
NETHERLANDS
Contingent liabilities, commitments and guarantees [Line Items]
Number of class actions named as defendant \| classAction	2
Capital commitments excluding investment property
Contingent liabilities, commitments and guarantees [Line Items]
Capital commitments	£ 733	640
Investment property
Contingent liabilities, commitments and guarantees [Line Items]
Capital commitments	392	236
Maximum exposure
Contingent liabilities, commitments and guarantees [Line Items]
Irrevocable commitments and guarantees	85,195	£ 79,518
Legal proceedings contingent liability
Contingent liabilities, commitments and guarantees [Line Items]
Increase in current tax liabilities	975
Reduction in deferred tax asset	£ (275)

The amount of future capital expenditures that the entity is committed to make.

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The amount of the estimated financial effect of contingent liabilities. [Refer: Classes of contingent liabilities [domain]]

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

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

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Increase (Decrease) In Current Tax Liability

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Number of Class Actions Named As Defendant

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