Fair values of financial assets and liabilities - Schedule of Significant Unobservable Inputs Used in Fair Value Measurement (Details) £ in Millions	Jun. 30, 2026 GBP (£)	Dec. 31, 2025 GBP (£)
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	£ 258,373	£ 240,413
Financial assets at fair value through other comprehensive income	40,428	36,320
Derivative financial assets	20,731	19,727
Total financial assets carried at fair value	319,532	296,460
Financial liabilities at fair value through profit or loss	31,310	27,909
Derivative financial liabilities	17,826	16,132
Total financial liabilities carried at fair value	115,775	105,681
Recurring fair value measurement
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	9,870	10,251
Financial assets at fair value through other comprehensive income	101	101
Derivative financial assets	481	464
Financial assets at fair value through other comprehensive income and derivative financial instruments	582	565
Total financial assets carried at fair value	10,452	10,816
Derivative financial liabilities	204	224
Total financial liabilities carried at fair value	221	241
Recurring fair value measurement \| Credit spreads \| Discounted cash flows \| Securitisation notes and other
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial liabilities at fair value through profit or loss	17	17
Recurring fair value measurement \| HPI growth \| Market values - property valuation \| Shared appreciation rights
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Derivative financial liabilities	101	111
Recurring fair value measurement \| Interest rate ATM volatility \| Option pricing model \| Interest rate derivatives
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Derivative financial liabilities	£ 103	£ 113
Recurring fair value measurement \| Minimum \| Credit spreads \| Discounted cash flows \| Securitisation notes and other \| Financial liabilities at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, liabilities	0.0349	0.0349
Recurring fair value measurement \| Minimum \| HPI growth \| Market values - property valuation \| Shared appreciation rights \| Derivative financial liabilities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, liabilities	0.03	0.03
Recurring fair value measurement \| Minimum \| Interest rate ATM volatility \| Option pricing model \| Interest rate derivatives \| Derivative financial liabilities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, liabilities	0.0056	0.0038
Recurring fair value measurement \| Maximum \| Credit spreads \| Discounted cash flows \| Securitisation notes and other \| Financial liabilities at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, liabilities	0.0349	0.0349
Recurring fair value measurement \| Maximum \| HPI growth \| Market values - property valuation \| Shared appreciation rights \| Derivative financial liabilities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, liabilities	0.04	0.04
Recurring fair value measurement \| Maximum \| Interest rate ATM volatility \| Option pricing model \| Interest rate derivatives \| Derivative financial liabilities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, liabilities	0.0093	0.0082
Loans and advances to customers \| Recurring fair value measurement
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	£ 5,913	£ 6,058
Loans and advances to customers \| Recurring fair value measurement \| Credit spreads \| Discounted cash flows
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	5,790	5,923
Loans and advances to customers \| Recurring fair value measurement \| HPI growth \| Market values - property valuation
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	£ 123	£ 135
Loans and advances to customers \| Recurring fair value measurement \| Minimum \| Credit spreads \| Discounted cash flows \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.0084	0.0080
Loans and advances to customers \| Recurring fair value measurement \| Minimum \| HPI growth \| Market values - property valuation \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.03	0.03
Loans and advances to customers \| Recurring fair value measurement \| Maximum \| Credit spreads \| Discounted cash flows \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.0407	0.0853
Loans and advances to customers \| Recurring fair value measurement \| Maximum \| HPI growth \| Market values - property valuation \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.04	0.04
Debt securities \| Recurring fair value measurement
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	£ 2,704	£ 2,758
Debt securities \| Recurring fair value measurement \| Credit spreads \| Discounted cash flows
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	780	869
Financial assets at fair value through other comprehensive income	49	50
Debt securities \| Recurring fair value measurement \| Earnings multiple \| Market values - property valuation
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	£ 1,924	£ 1,889
Debt securities \| Recurring fair value measurement \| Minimum \| Credit spreads \| Discounted cash flows \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.0112	0.0113
Debt securities \| Recurring fair value measurement \| Minimum \| Credit spreads \| Discounted cash flows \| Financial assets at fair value through other comprehensive income
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.0287	0.0287
Debt securities \| Recurring fair value measurement \| Minimum \| Earnings multiple \| Market values - property valuation \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.03	0
Debt securities \| Recurring fair value measurement \| Maximum \| Credit spreads \| Discounted cash flows \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.0650	0.0925
Debt securities \| Recurring fair value measurement \| Maximum \| Credit spreads \| Discounted cash flows \| Financial assets at fair value through other comprehensive income
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.0308	0.0308
Debt securities \| Recurring fair value measurement \| Maximum \| Earnings multiple \| Market values - property valuation \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.28	0.16
Equity shares \| Recurring fair value measurement
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	£ 1,253	£ 1,435
Equity shares \| Recurring fair value measurement \| Price \| Net asset value
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	874	1,057
Financial assets at fair value through other comprehensive income	52	51
Equity shares \| Recurring fair value measurement \| Earnings multiple \| Market values - property valuation
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	£ 379	£ 378
Equity shares \| Recurring fair value measurement \| Minimum \| Earnings multiple \| Market values - property valuation \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.03	0
Equity shares \| Recurring fair value measurement \| Maximum \| Earnings multiple \| Market values - property valuation \| Financial assets at fair value through profit or loss
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.28	0.16
Interest rate derivatives \| Recurring fair value measurement \| Interest rate ATM volatility \| Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Derivative financial assets	£ 202	£ 202
Interest rate derivatives \| Recurring fair value measurement \| Uncertainty of recovery rates \| Discounted cash flows
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Derivative financial assets	£ 279	£ 262
Interest rate derivatives \| Recurring fair value measurement \| Minimum \| Interest rate ATM volatility \| Option pricing model \| Derivative financial liabilities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.0056	0.0038
Interest rate derivatives \| Recurring fair value measurement \| Minimum \| Uncertainty of recovery rates \| Discounted cash flows \| Derivative financial liabilities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.40	0.40
Interest rate derivatives \| Recurring fair value measurement \| Maximum \| Interest rate ATM volatility \| Option pricing model \| Derivative financial liabilities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.0093	0.0082
Interest rate derivatives \| Recurring fair value measurement \| Maximum \| Uncertainty of recovery rates \| Discounted cash flows \| Derivative financial liabilities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable input, assets	0.90	0.90

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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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.

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

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The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

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The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities]

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The value of significant unobservable input used in the measurement of the fair value of assets.

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The value of significant unobservable input used in the measurement of the fair value of liabilities.

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Financial Assets At Fair Value Through Other Comprehensive Income And Derivative Financial Assets

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